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SX20AC Schematic ( PDF Datasheet ) - SCENIX

Teilenummer SX20AC
Beschreibung (SXxxxx) Configurable Communications Controllers
Hersteller SCENIX
Logo SCENIX Logo 




Gesamt 30 Seiten
SX20AC Datasheet, Funktion
January 19, 2000
SX18AC/SX20AC/SX28AC/SX18AC75/SX20AC75/SX28AC75
Configurable Communications Controllers with EE/Flash Program
Memory, In-System Programming Capability and On-Chip Debug
1.0 PRODUCT OVERVIEW
1.1 Introduction
The Scenix SX family of configurable communications
controllers are fabricated in an advanced CMOS process
technology. The advanced process, combined with a
RISC-based architecture, allows high-speed computa-
tion, flexible I/O control, and efficient data manipulation.
Throughput is enhanced by operating the device at fre-
quencies up to 50/75 MHz and by optimizing the instruc-
tion set to include mostly single-cycle instructions. In
addition, the SX architecture is deterministic and totally
reprogramable. The unique combination of these charac-
teristics enables the device to implement hard real-time
functions as software modules (Virtual Peripheral™) to
replace traditional hardware functions.
On-chip functions include a general-purpose 8-bit timer
with prescaler, an analog comparator, a brown-out detec-
tor, a watchdog timer, a power-save mode with multi-
source wakeup capability, an internal R/C oscillator, user-
selectable clock modes, and high-current outputs.
OSC1 OSC2
RTCC
OSC
D river
4MHz
Internal
RC OSC
Clock
S ele c t
÷ 4 or ÷ 1
System Clock
P ow er-O n
Reset
MCLR
RESET
B row n -O ut
MIW U
8
Instruction
Pipeline
Fetch
Decode
E x ec u tiv e
Write Back
PC
3 Level
Stack
8
8-bit Watchdog
Tim er (W DT)
8-bit Tim er
RTCC
Interrupt Stack
Prescaler for RTCC
or
Prescaler for W DT
Interrupt
MIW U
8
Port B
3
System
C lo ck
88
Internal Data Bus
W
FSR
PC
STATU S
O PT IO N
8
8
8
Address
88
ALU
136 Bytes
SRAM
Address 12
In-System
D e bu g g ing
In-System
Programm ing
2k Words
EEPROM
8
Port A
4
A n alo g
Comp
8
8
Port C
8
MODE
8 W rite Data
8 Read Data
12 Instruction
IR EAD
Figure 1-1. Block Diagram
Scenix™ and the Scenix logo are trademarks of Scenix Semiconductor, Inc.
I2C™ is a trademark of Philips Corporation
Microwire™ is a trademark of National Semiconductor Corporation
All other trademarks mentioned in this document are property of their respec-
tive companies.
© 2000 Scenix Semiconductor, Inc. All rights reserved.
-1-
www.scenix.com






SX20AC Datasheet, Funktion
SX18AC/SX20AC/SX28AC/SX18AC75/SX20AC75/SX28AC75
2.3 Part Numbering
Device
SX18AC/SO
SX18AC-I/SO
SX18AC75/SO
SX18AC/DP
SX18AC-I/DP
SX18AC75/DP
SX20AC/SS
SX20AC-I/SS
SX20AC75/SS
SX28AC/SO
SX28AC-I/SO
SX28AC75/SO
SX28AC/DP
SX28AC-I/DP
SX28AC75/DP
SX28AC/SS
SX28AC-I/SS
SX28AC75/SS
Pins I/O
18 12
18 12
18 12
18 12
18 12
18 12
20 12
20 12
20 12
28 20
28 20
28 20
28 20
28 20
28 20
28 20
28 20
28 20
Table 2-1. Ordering Information
Operating
Frequency (MHz)
EE/Flash
(Words)
50 2K
50 2K
75 2K
50 2K
50 2K
75 2K
50 2K
50 2K
75 2K
50 2K
50 2K
75 2K
50 2K
50 2K
75 2K
50 2K
50 2K
75 2K
RAM
(Bytes)
136
136
136
136
136
136
136
136
136
136
136
136
136
136
136
136
136
136
Operating
Temp. (°C)
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
SX18ACXX-I/SO
DP = DIP
SO = SOP
Package Type
SS = SSOP
TQ = Tiny PQFP
PQ = PQFP
Extended Temperature
Speed
Memory Size
Feature Set
Pin Count
Blank = 50 MHz
75 = 75 MHz
100 = 100 MHz
SceniX
A = 512 word
B = 1k word
C = 2k word
D = 4k word
Blank = 0°C to +70°C
I = -40°C to +85°C
Figure 2-1. Part Number Reference Guide
© 2000 Scenix Semiconductor, Inc. All rights reserved.
-6-
www.scenix.com

6 Page









SX20AC pdf, datenblatt
SX18AC/SX20AC/SX28AC/SX18AC75/SX20AC75/SX28AC75
4.3 OPTION Register
RTW
RTE
_IE
RTS
RTE
_ES
PSA
PS2
PS1
PS0
Bit 7
Bit 0
When the OPTIONX bit in the FUSE word is cleared, bits
7 and 6 of the OPTION register function as described
below.
When the OPTIONX bit is set, bits 7 and 6 of the
OPTION register read as ‘1’s.
RTW
RTE_IE
RTS
RTE_ES
PSA
PS2-PS0
RTCC/W register selection:
0 = Register 01h addresses W
1 = Register 01h addresses RTCC
RTCC edge interrupt enable:
0 = RTCC roll-over interrupt is enabled
1 = RTCC roll-over interrupt is disabled
RTCC increment select:
0 = RTCC increments on internal instruction
cycle
1 = RTCC increments upon transition on
RTCC pin
RTCC edge select:
0 = RTCC increments on low-to-high transi-
tions
1 = RTCC increments on high-to-low transi-
tions
Prescaler Assignment:
0 = Prescaler is assigned to RTCC, with di-
vide rate determined by PS0-PS2 bits
1 = Prescaler is assigned to WDT, and divide
rate on RTCC is 1:1
Prescaler divider (see Table 4-2)
Table 4-2. Prescaler Divider Ratios
PS2, PS1, PS0
RTCC
Divide Rate
Watchdog Timer
Divide Rate
000 1:2
1:1
001 1:4
1:2
010 1:8
1:4
011 1:16
1:8
100 1:32
1:16
101 1:64
1:32
110 1:128
1:64
111 1:256
1:128
Upon reset, all bits in the OPTION register are set to 1.
© 2000 Scenix Semiconductor, Inc. All rights reserved.
- 12 -
www.scenix.com

12 Page





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