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PDF 8XC251TA Data sheet ( Hoja de datos )
| Número de pieza | 8XC251TA | |
| Descripción | HIGH-PERFORMANCE CHMOS MICROCONTROLLER | |
| Fabricantes | Intel Corporation | |
| Logotipo |  |
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ADVANCE INFORMATION
8xC251TA/TB/TP/TQ
HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Commercial/Express
s Real-time and Programmed Wait State
Bus Operation
s Binary-code Compatible with MCS® 51
s Pin Compatible with 44-pin PLCC and
40-pin PDIP MCS 51 Sockets
s Register-based MCS® 251 Architecture
— 40-byte Register File
— Registers Accessible as Bytes,
Words, or Double Words
s Enriched MCS 51 Instruction Set
— 16-bit and 32-bit Arithmetic and
Logic Instructions
— Compare and Conditional Jump
Instructions
— Expanded Set of Move Instructions
s Linear Addressing
s 256-Kbyte Expanded External
Code/Data Memory Space
s ROM Options:
16 Kbytes (TB/TQ), 8 Kbytes (TA/TP), or
without ROM
s 16-bit Internal Code Fetch
s 64-Kbyte Extended Stack Space
s On-chip Data RAM Options:
1-Kbyte (TA/TB) or 512-Byte (TP/TQ)
s 8-bit, 2-clock External Code Fetch in
Page Mode
s Fast MCS 251 Instruction Pipeline
s User-selectable Configurations:
— External Wait States (0-3 wait
states)
— Address Range & Memory Mapping
— Page Mode
— Extended Data Float Timings or
8xC251Sx Compatible AC Timings
s 32 Programmable I/O Lines
s Eight Maskable Interrupt Sources with
Four Programmable Priority Levels
s Three Flexible 16-bit Timer/counters
s Hardware Watchdog Timer
s Programmable Counter Array
— High-speed Output
— Compare/Capture Operation
— Pulse Width Modulator
— Watchdog Timer
s Two Programmable Serial I/O Ports
— Framing Error Detection
— Automatic Address Recognition
s High-performance CHMOS Technology
s Static Standby to 24-MHz Operation
s Complete System Development
Support
— Compatible with Existing Tools
— MCS 251 Tools Available:
Compiler, Assembler, Debugger,
ICE
s Package Options (PDIP and PLCC)
© INTEL CORPORATION, 1997
November, 1997
Order Number: 273129-001
1 page  
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
1.0 INTRODUCTION
A member of the Intel family of 8-bit MCS 251 micro-
controllers, the 8xC251TA/TB/TP/TQ is binary-code
compatible with MCS 51 microcontrollers and pin
compatible with 40-pin PDIP and 44-pin PLCC
MCS 51 microcontrollers. MCS 251 microcontrollers
feature an enriched instruction set, linear
addressing, and efficient C-language support. The
8xC251TA/TB/TP/TQ has 512 bytes or 1 Kbyte of
on-chip RAM and is available with 8 Kbytes or 16
Kbytes of on-chip ROM, or without ROM. A variety of
features can be selected by new user-programmable
configurations.
System Bus and I/O Ports
P0.7:0
P2.7:0
Port 0
Drivers
Port 2
Drivers
Code
OTPROM/ROM
8 Kbytes
or
16 Kbytes
Data RAM
512 Bytes
or
1024 Bytes
I/O Ports and
Peripheral Signals
P1.7:0
P3.7:0
Port 1
Drivers
Port 3
Drivers
Memory Data (16)
Memory Address (16)
Bus Interface
Code Bus (16)
Code Address (24)
Instruction Sequencer
SRC1 (8)
Peripheral
Interface
Interrupt
Handler
Watchdog
Timer
Timer/
Counters
PCA
SRC2 (8)
ALU
Register
File
Data
Memory
Interface
Clock
&
Reset
Two
Serial I/O
Ports
Peripherals
DST (16)
MCS® 251 Microcontroller Core
Clock & Reset
8XC251TA/TB/TP/TQ Microcontroller
Figure 1. 8xC251TA/TB/TP/TQ Block Diagram
ADVANCE INFORMATION
A4530-01
1
5 Page 
8xC251TA/TB/TP/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Table 5. 8xC251TA/TB/TP/TQ PLCC/DIP Pin Assignments Arranged by Functional Category
Address & Data
Input/Output
Name
PLCC DIP
Name
PLCC DIP
AD0/P0.0
43 39
P1.0/T2
21
AD1/P0.1
42 38
P1.1/T2EX
32
AD2/P0.2
41 37
P1.2/ECI/RXD1
43
AD3/P0.3
40 36
P1.3/CEX0/TXD1
54
AD4/P0.4
39 35
P1.4/CEX1
65
AD5/P0.5
38 34
P1.5/CEX2
76
AD6/P0.6
37 33
P1.6/CEX3/WAIT#
87
AD7/P0.7
36 32
P1.7/CEX4/A17/WCLK 9
8
A8/P2.0
24 21
P3.0/RXD
11 10
A9/P2.1
25 22
P3.1/TXD
13 11
A10/P2.2
26 23
P3.4/T0
16 14
A11/P2.3
27 24
P3.5/T1
17 15
A12/P2.4
28 25
A13/P2.5
29 26
Power & Ground
A14/P2.6
30 27
Name
PLCC DIP
A15/P2.7
P3.7/RD#/A16
P1.7/CEX4/A17/WCLK
31
19
9
28
17
8
Processor Control
VCC
VCC2
VSS
VSS1
VSS2
EA#
44
12
22
1
23, 34
35
40
20
31
Name
PLCC DIP
P3.2/INT0#
14 12
Bus Control & Status
P3.3/INT1#
15 13
Name
PLCC DIP
EA#
35 31
P3.6/WR#
18 16
RST
10 9
P3.7/RD#/A16
19 17
XTAL1
21 18
ALE
33 30
XTAL2
20 19
PSEN#
32 29
ADVANCE INFORMATION
7
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| PDF Descargar | [ Datasheet 8XC251TA.PDF ] | |
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