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
1.1
PRODUCT OVERVIEW
Introduction
teristics enables the device to implement hard real-time
functions as software modules (Virtual Peripheral™) to
replace traditional hardware functions.
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 computation, flexible I/O control, and efficient data manipulation.
Throughput is enhanced by operating the device at frequencies up to 50/75 MHz and by optimizing the instruction set to include mostly single-cycle instructions. In
addition, the SX architecture is deterministic and totally
reprogramable. The unique combination of these charac-
On-chip functions include a general-purpose 8-bit timer
with prescaler, an analog comparator, a brown-out detector, a watchdog timer, a power-save mode with multisource wakeup capability, an internal R/C oscillator, userselectable clock modes, and high-current outputs.
RT C C
O S C 1 O S C2
O SC
8-bit W atchdog
8-bit T im er
Clock
D river
RT C C
T im er (W DT )
S elect
4M Hz
Internal
÷ 4 or ÷ 1
RC OSC
Interrupt Stack
System C lock
8
M C LR
Prescaler for R T CC
P ow er-O n
A nalog
3
or
R eset
Interrupt
RE S ET
M IW U
P ort B
C om p
P rescaler for W DT
B row n-O ut
8
8
8
M IW U S ystem
C lock
Internal D ata B us
8
8
8
8
8 8
8
8
W
In-System
PC
D ebugging
Port A Port C
3 Level
8
A LU
FSR
A ddress
S tack
Fetch
In-S ystem
4
8
Instruction
PC
P rogram m ing
Decode
Pipeline
136 Bytes
STATU S
S R AM
E xecutive
2k W ords
A ddress 12
E E P RO M
O PT IO N
W rite Back
MODE
8
W rite D ata
R ead D ata
8
Instruction
12
IR E A D
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
© 2000 Scenix Semiconductor, Inc. All rights reserved.
All other trademarks mentioned in this document are property of their respective companies.
-1-
www.scenix.com