三个8位微控制器8XC51RA 8XC51RB 8XC51R

1.0 INTRODUCTION  1
2.0 MEMORY ORGANIZATION  1
2.1 Program Memory  1
2.2 Data Memory  1
3.0 SPECIAL FUNCTION
REGISTERS  4
4.0 PORT STRUCTURES AND
OPERATION  6
4.1 I/O Configurations  6
4.2 Writing to a Port  7
4.3 Port Loading and Interfacing  9
4.4 Read-Modify-Write Feature  9
4.5 Accessing External Memory  9
5.0 TIMERS/COUNTERS  11
5.1 Timer 0 and Timer 1  11
5.2 Timer 2  14
6.0 SERIAL INTERFACE  18
6.1 Framing Error Detection  19
6.2 Multiprocessor Communications  19
6.3 Automatic Address Recognition  19
6.4 Baud Rates  25
6.5 Using Timer 1 to Generate Baud
Rates  25
6.6 Using Timer 2 to Generate Baud
Rates  25
CONTENTS PAGE
7.0 HARDWARE WATCHDOG TIMER
(ONE-TIME ENABLED WITH RESETOUT)
 23
7.1 Using the WDT  23
7.2 WDT during Power Down and
Idle  23
8.0 INTERRUPTS  24
8.1 External Interrupts  25
8.2 Timer Interrupts  25
8.3 Serial Port Interrupt  25
8.4 Interrupt Enable  25
8.5 Priority Level Structure  31
8.6 Response Time  29
9.0 RESET  29
9.1 Power-On Reset  30
10.0 POWER-SAVING MODES OF
OPERATION  30
10.1 Idle Mode  30
10.2 Power Down Mode  32
10.3 Power Off Flag  32
11.0 ALE DISABLE  32
12.0 EPROM VERSIONS  32
13.0 PROGRAM MEMORY LOCK  32
14.0 ONCE MODE  33
15.0 ON-CHIP OSCILLATOR  34
16.0 CPU TIMING  35