Intel MCS 51

MCWI51 PROGRAMMER’S CONTENTS
PAGE
GUIDE AND MEMORYORGANIZATION
........................2-3
INSTRUCTION SET PROGRAM MEMORY
.................................2-3
Data Memory
...............................................2-4
INDIRECT ADDRESS AREA,...........,.........2-6
DIRECT AND INDIRECT ADDRESS
AREA ......................................................2-6
SPECIAL FUNCTION REGISTERS............2-8
WHAT DO THE SFRS CONTAIN JUST
AFTER POWER-ON OR A RESET,......,,2-9
SFR MEMORY MAP
.................................2-lo
PSW: PROGRAM STATUS WORD. BIT
ADDRESSABLE
...................................2-1 1
PCON: POWER CONTROL REGISTER.
NOT BIT ADDRESSABLE .....,..,........,..2-11
INTERRUPTS
............................................2-1 2
IE: INTERRUPT ENABLE REGISTER.
BIT ADDRESSABLE
............................2-12
ASSIGNING HIGHER PRIORITY TO
ONE OR MORE INTERRUPTS..,.........,2-13
PRIORITY WITHIN LEVEL
.......................2-13
1P:INTERRUPT PRIORITY REGISTER.
BIT ADDRESSABLE ..,..........,.,,...........2-13
TCON: TIMEFVCOUNTERCONTROL
REGISTER. BIT ADDRESSABLE ......,.2-14
TMOD: TIMEWCOUNTER MODE
CONTROL REGISTER. NOT BIT
ADDRESSABLE
...................................2-14
TIMER SET-UP .........................................2-1 5
TIMEFVCOUNTERO
,..............,..,........,.,..2-15
TIMER/COUNTER 1
..................................2-16
T2CON: TIMEWCOUNTER 2 CONTROL
REGISTER. BIT ADDRESSABLE ........2-17
TIMEWCOUNTER 2 SET-UP ...................2-18
SCON: SERIAL PORT CONTROL
REGISTER. BIT ADDRESSABLE ....,...2-19
2-1