8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
System Bus and I/O Ports
P0.7:0
P2.7:0
Code
OTPROM/ROM
8 Kbytes
or
16 Kbytes
I/O Ports and
Peripheral Signals
P1.7:0
P3.7:0
Port 0
Drivers
Port 2
Drivers
Data RAM
512 Bytes
or
1024 Bytes
Port 1
Drivers
Port 3
Drivers
Memory Data (16)
Memory Address (16)
Watchdog
Timer
Bus Interface
Code Bus (16)
Code Address (24)
Peripheral
Interface
Timer/
Counters
Instruction Sequencer
Data Address (24)
Interrupt
Handler
IB Bus (8)
PCA
SRC2 (8)
Data Bus (8)
SRC1 (8)
Serial I/O
Clock
&
Reset
Peripherals
ALU
Register
File
Data
Memory
Interface
DST (16)
MCS
®
251 Microcontroller Core
Clock & Reset
8XC251SA/SB/SP/SQ Microcontroller
A4214-01
Figure 1. 8XC251SA/SB/SP/SQ Block Diagram
PRELIMINARY
3
INTEL [ INTEL CORPORATION ]
