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ST62T28C Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer ST62T28C
Beschreibung 8-BIT MCUs WITH A/D CONVERTER
Hersteller ST Microelectronics
Logo ST Microelectronics Logo 




Gesamt 30 Seiten
ST62T28C Datasheet, Funktion
ST62T28C/E28C
8-BIT MCUs WITH A/D CONVERTER, AUTO-RELOAD
TIMER, UART, OSG, SAFE RESET AND 28-PIN PACKAGE
s 3.0 to 6.0V Supply Operating Range
s 8 MHz Maximum Clock Frequency
s -40 to +125°C Operating Temperature Range
s Run, Wait and Stop Modes
s 5 Interrupt Vectors
s Look-up Table capability in Program Memory
s Data Storage in Program Memory:
User selectable size
s Data RAM: 192 bytes
s User Programmable Options
s 20 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
s 8 I/O lines can sink up to 20mA to drive LEDs or
TRIACs directly
s 8-bit Timer/Counter with 7-bit programmable
prescaler
s 8-bit Auto-reload Timer with 7-bit programmable
prescaler (AR Timer)
s Digital Watchdog
s 8-bit A/D Converter with 12 analog inputs
s 8-bit Asynchronous Peripheral Interface
(UART)
s 8-bit Synchronous Peripheral Interface (SPI)
s On-chip Clock oscill ator can be driven by
Quartz Crystal, Ceramic resonator or RC
network
s Oscillator Safe Guard
s Low Voltage Detector for safe Reset
s One external Non-Maskable Interrupt
s ST623x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port).
DEVICE SUMMARY
DEVICE
ST62T28C
ST62E28C
OTP
(Bytes)
7948
EPROM
(Bytes)
-
7948
I/O Pins
20
20
November 1999
PDIP28
PS028
SS0P28
CDIP28W
(See end of Datasheet for Ordering Information)
Rev. 2.8
1/84
1






ST62T28C Datasheet, Funktion
ST62T28C/E28C
1.2 PIN DESCRIPTIONS
VDD and VSS. Power is supplied to the MCU via
these two pins. VDD is the power connection and
VSS is the ground connection.
OSCin and OSCout. These pins are internally
connected to the on-chip oscillator circuit. A quartz
crystal, a ceramic resonator or an external clock
signal can be connected between these two pins.
The OSCin pin is the input pin, the OSCout pin is
the output pin.
RESET. The active-low RESET pin is used to re-
start the microcontroller.
TEST/VPP. The TEST must be held at VSS for nor-
mal operation. If TEST pin is connected to a
+12.5V level during the reset phase, the EPROM/
OTP programming Mode is entered.
NMI. The NMI pin provides the capability for asyn-
chronous interruption, by applying an external non
maskable interrupt to the MCU. The NMI input is
falling edge sensitive with Schmitt trigger charac-
teristics. The user can select as option the availa-
bility of an on-chip pull-up at this pin.
PA0-PA5. These 6 lines are organised as one I/O
port (A). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, input with interrupt generation and
pull-up resistor, open-drain or push-pull outputs.
PA2/ARTIMout and PA3/ARTIMin can be used re-
spectively as output and input pins for the embed-
ded 8-bit Auto-Reload Timer.
In addition, PA0-PA5 can sink 20mA for direct LED
or TRIAC drive.
PB4...PB6. These 3 lines are organised as one I/O
port (B). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, input with interrupt generation and
pull-up resistor, open-drain or push-pull outputs,
analog inputs for the A/D converter.
PC4-PC7. These 4 lines are organised as one I/O
port (C). Each line may be configured under soft-
ware control as input with or without internal pull-
up resistor, input with interrupt generation and
pull-up resistor, open-drain or push-pull output.
PC4 and PC5 can also be used as analog input for
the A/D converter, while PC6 and PC7 can sink
20mA for direct LED or TRIAC drive.
PD1...PD7. These 7 lines are organised as one I/O
port (portD). Each line may be configured under
software control as input with or without internal
pull-up resistor, input with interrupt generation and
pull-up resistor, analog input open-drain or push-
pull output. In addition, the pins PD5/TXD1 and
PD4/RXD1 can be used as UART output (PD5/
TXD1) or UART input (PD4/RXD1). The pins PD3/
Sout, PD2/Sin and PD3/Scl can also be used re-
spectively as data out, data in and clock pins for
the on-chip SPI.
TIMER. This is the TIMER 1 I/O pin. In input mode,
it is connected to the prescaler and acts as ex-
ternal timer clock or as control gate for the internal
timer clock. In output mode, the TIMER pin outputs
the data bit when a time-out occurs.The user can
select as option the availability of an on-chip pull-
up at this pin.
Figure 2. ST62T28C/E28C Pin Configuration
VDD
TIME R
OSCin
OSCout
NMI
PC7*
PC6*
Ain/PC5
Ain/PC4
TEST/VPP(1)
RESET
Ain/PB6
Ain/PB5
Ain/PB4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
(1) V on EPROM/OTP only
PP
(*) 20 mA Sink
28 VSS
27 PA0*
26 PA1*
25 PA2*/ARTIMout
24 PA3*/ARTIMin
23 PA4*
22 PA5*
21 PD1/Ain/Scl
20 PD2/Ain/Sin
19 PD3/Ain/Sout
18 PD4/Ain/RXD1
17 PD5/Ain/TXD1
16 PD6/Ain
15 PD7/Ain
VR01804B
6/84
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6 Page









ST62T28C pdf, datenblatt
ST62T28C/E28C
1.4 PROGRAMMING MODES
1.4.1 Option Bytes
The two Option Bytes allow configuration capabili-
ty to the MCUs. Option byte’s content is automati-
cally read, and the selected options enabled, when
the chip reset is activated.
It can only be accessed during the programming
mode. This access is made either automatically
(copy from a master device) or by selecting the
OPTION BYTE PROGRAMMING mode of the pro-
grammer.
The option bytes are located in a non-user map.
No address has to be specified.
EPROM Code Option Byte (LSB)
7
PRO -
TECT
OSCIL
PORT
PULL
-
0
NMI
PULL
TI M
PULL
WDACT
OS-
GEN
EPROM Code Option Byte (MSB)
15
--
8
-
ADC
UART
SYNCHRO FRAME
-
EXTC-
NTL
LVD
D15-D13. Reserved. Must be cleared.
ADC SYNCHRO. When set, an A/D conversion is
started upon WAIT instruction execution, in order
to reduce supply noise. When this bit is low, an A/
D conversion is started as soon as the STA bit of
the A/D Converter Control Register is set.
D11. UART Frame. When set, UART transmission
and reception are based on a 11-bit frame. When
cleared, a 10-bit frame is used.
D10. Reserved.
EXTCNTL. External STOP MODE control.. When
EXTCNTL is high, STOP mode is available with
watchdog active by setting NMI pin to one. When
EXTCNTL is low, STOP mode is not available with
the watchdog active.
LVD. LVD RESET enable.When this bit is set, safe
RESET is performed by MCU when the supply
voltage is too low. When this bit is cleared, only
power-on reset or external RESET are active.
PROTECT. Readout Protection. This bit allows the
protection of the software contents against piracy.
When the bit PROTECT is set high, readout of the
OTP contents is prevented by hardware.. When
this bit is low, the user program can be read.
OSCIL. Oscillator selection. When this bit is low,
the oscillator must be controlled by a quartz crys-
tal, a ceramic resonator or an external frequency.
When it is high, the oscillator must be controlled by
an RC network, with only the resistor having to be
externally provided.
D5. Port Pull. This bit must be set high to disable
pull-up at reset on the I/O port. When this bit is
low,I/O ports are in input with pull-up.
D4. Reserved. Must be cleared to zero.
NMI PULL. NMI Pull-Up. This bit must be set high
to configure the NMI pin with a pull-up resistor.
When it is low, no pull-up is provided.
TIM PULL.TIM Pull-Up. This bit must be set high
to configure the TIMER pin with a pull-up resistor.
When it is low, no pull-up is provided.
WDACT. This bit controls the watchdog activation.
When it is high, hardware activation is selected.
The software activation is selected when WDACT
is low.
OSGEN. Oscillator Safe Guard. This bit must be
set high to enable the Oscillator Safe Guard.
When this bit is low, the OSG is disabled.
The Option byte is written during programming ei-
ther by using the PC menu (PC driven Mode) or
automatically (stand-alone mode).
12/84
12

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