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SC73C1402E Schematic ( PDF Datasheet ) - Silan Microelectronics

Teilenummer SC73C1402E
Beschreibung 4BIT MCU FOR REMOTE CONTROLLER
Hersteller Silan Microelectronics
Logo Silan Microelectronics Logo 




Gesamt 19 Seiten
SC73C1402E Datasheet, Funktion
SC73C1402
4-BIT MCU FOR REMOTE CONTROLLER(MASK TYPE)
DESCRIPTION
SC73C1402 is one of Silan’s 4-bit CMOS single-chip micro-
controllers for infrared remote control transmitters (IRCTs). It can
be implemented in various IRCT circuits by mask option.
SOP-20-300-1.27
FEATURES
* Operating voltage range: (2.0 ~ 4.0V)
Low static power consumption (<1uA)
SOP-20-375-1.27
* Program memory: 2Kx 9 bits
The last 1K areas can also be used as data table
* Data memory (RAM): 16 x 4 bits
* Timer/counter: 10~15 bits
SSOP-20-300-0.65
* 20 I/O ports, where there is a 4-bit input, two 4-bit outputs and
two 4-bit programmable input/output ports(P53 is output but ORDERING INFORMATION
not used as keypress).
* Oscillator frequency (fosc):
Device
Package
300KHz~2MHz or 2MHz~6MHz selectable by mask option
SC73C1402
SOP-24-375-1.27
* Operating frequency (fmain):
SC73C1402A SOP-20-300-1.27
fmain=fosc (when fosc in the range of 300KHz~2MHz)
SC73C1402B SSOP-20-300-0.65
fmain=fosc/8 (when fosc in the range of 2MHz~6MHz)
* Carrier frequency: fmain/12
* Carrier duty: 1/2 or 1/3 duty selectable by program
* Instruction cycle: 5/fmain
SC73C1402C
SC73C1402D
SC73C1402E
SOP-20-375-1.27
DIE
SSOP-24-300-0.65
* Handles various user’s codes, repeat key, persist-key press APPLICATIONS
www.DataSheet4Ua.ncdommany other functions
* Power on reset
* Supports voltage-drop detection
* Supports 56 keys in 20-pin package, and 80 keys in 24-pin
package.
* Infrared remote control devices, such
as TV, Video Cassette Recorder, VTR,
laser phonograph and acoustics
remote controllers.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2005.12.19
Page 1 of 20






SC73C1402E Datasheet, Funktion
SC73C1402
6. LR
LR refers to the L register (4 bits). It is often used to store the pointer of RAM addresses, and can also be
used as a general-purpose register.
7. RAM
RAM refers to data memory. It consists of 16 x 4bits and is used to store temporary data and results after a
program is executed. There are two RAM addressing modes: one for indirect addressing by the LR register, it
can address the entire RAM areas. The other is instruction direct addressing, the lower 3-bit of the instruction
specifying the address of the RAM. It can be used to address the lower 8-bit of the RAM, but SC73C1402 does
not support this mode. When reset, the contents of RAM are not defined. We recommend users to initialize it at
the beginning of the program.
8. ALU
The arithmetic and logic unit plays a leading role in performing various operations of 4-bit binaries. The
operation of the ALU will change the carry flag and the zero flag.
9. Acc
4-bit accumulator, it is mostly used to store data and results.
10. CF
CF refers to carry flag.
11. SF
SF refers to the status flag. When reset, the status flag is initialized to 1.
12. PR
PR refers to the port register, which specifies the input mode or output mode of the I/O ports, is 4-bit write-
www.DataSheeot4nUly.c. oWmhen one bit of PR is 1, the corresponding port is set to output mode; if the bit of PR is 0; then set to input
mode. The execution of the HOLD instruction won’t affect the status of PORT1 and PORT2. When reset, the
value of the PR is 0000B.
P2S
P1HS
P1LS
P11, P10 mode select
P13, P12 mode select
PORT2 mode select
13. PORT
SC73C1402 has five groups of I/O ports, altogether 20 pins.
P0 port: P03~P00, 4-bit input port, with internal pull-down resistor; it can release the HOLD mode at high
level.
P1 port (P13~P10) and P2 port (P23~P20) can be set to input/output mode by program. In input mode, it
can release HOLD mode at high level.
P3 port (P30~P33) output port.
P5 port (P53, P52, P51, P50)
P50: output pin, P-channel open-drain output, this pin is always used to select system code.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2005.12.19
Page 6 of 20

6 Page









SC73C1402E pdf, datenblatt
SC73C1402
8. Others
Instruction
HOLD
NOP
TMRST
Operation
Reset timer counter
CF SF
--- 1
--- ---
--- ---
Cycle
1
1
1
a. HOLD instruction
After executing this instruction, the MCU is in the power-save mode, the clock
stops oscillation, and power consumption reduces.
b. NOP instruction
Null operation. It doesn’t affect anything.
c. TMRST
Timer clear command, it will clear all values of the timer to 0. This instruction is
often used to reset the WDT in program.
Note: C: CF, the carry flag is 1 if there is a carry when executing the addition instructions, or if there is no borrow
when executing the subtract instructions.
Z: Zero, when the data sent to ACC and RAM is 0, the zero flag is 1.
*: The asterisk symbol means the value of the corresponding flag is directly set by the instruction.
--: This symbol means the instruction won’t affect the corresponding flag.
www.DataSheet4U.com
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2005.12.19
Page 12 of 20

12 Page





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