© 2000 Scenix Semiconductor, Inc. All rights reserved.
- 1 -
www.scenix.com
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.
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.
Figure 1-1. Block Diagram
Interrupt
MIW U
Port B
Comp
Power-O n
Reset
RESET
8-bit W atchdog
Tim er (W DT)
8-bit Tim er
RTCC
8
8
8
Port C
8
8
Port A
8
4
Internal Data Bus
In-System
Debugging
In-System
Programm ing
2k W ords
EEPRO M
System
Clock
Brown-O ut
MIW U
M CLR
O SC
Driver
4M Hz
Internal
RC OSC
Clock
Select
¸ 4 or ¸ 1
136 Bytes
SRAM
Address
W rite Data
Read Data
Instruction
W
FSR
STATUS
PC
M O DE
OPTIO N
System Clock
OSC1 O SC2
Fetch
8
8
12
Address
12
8
8
8
8
ALU
8
8
8
3
RTCC
Analog
8
Interrupt Stack
PC
3 Level
Decode
Executive
W rite Back
IREAD
Stack
Instruction
Pipeline
Prescaler for RTCC
or
Prescaler for W DT
