TIMER/COUNTER UNIT
9-20
Example 9-1. Configuring a Real-Time Clock (Continued)
sti
;enable interrupts
pop
si
;restore saved registers
pop
dx
pop
ax
pop
bp
;restore caller’s bp
ret
_set_time endp
timer_2_interrupt_routine proc far
push
ax
;save registers used
push
dx
cmp
_msec, 99
;has 1 sec passed?
jae
bump_second
;if above or equal...
inc
_msec
jmp
short reset_int_ctl
bump_second:
mov
_msec, 0
;reset millisecond
cmp
_minute, 59
;has 1 minute passed?
jae
bump_minute
inc
_second
jmp
short reset_int_ctl
bump_minute:
mov
_second, 0
;reset second
cmp
_minute, 59
;has 1 hour passed?
jae
bump_hour
inc
_minute
jmp
short reset_int_ctl
bump_hour:
mov
_minute, 0
;reset minute
cmp
_hour, 12
;have 12 hours passed?
jae
reset_hour
inc
_hour
jmp
reset_int_ctl
reset_hour:
mov
_hour, 1
;reset hour
reset_int_ctl:
mov
dx, EOI
mov
ax, 8000h
;non-specific end of interrupt
out
dx, al
pop
dx
pop
ax
iret
timer_2_interrupt_routine endp
lib_80186
ends
end
Содержание 80C186EA
Страница 1: ...80C186EA 80C188EA Microprocessor User s Manual...
Страница 2: ...80C186EA 80C188EA Microprocessor User s Manual 1995...
Страница 19: ......
Страница 20: ...1 Introduction...
Страница 21: ......
Страница 28: ...2 Overview of the 80C186 Family Architecture...
Страница 29: ......
Страница 79: ......
Страница 80: ...3 Bus Interface Unit...
Страница 81: ......
Страница 129: ......
Страница 130: ...4 Peripheral Control Block...
Страница 131: ......
Страница 139: ......
Страница 140: ...5 ClockGenerationand Power Management...
Страница 141: ......
Страница 165: ......
Страница 166: ...6 Chip Select Unit...
Страница 167: ......
Страница 190: ...7 Refresh Control Unit...
Страница 191: ......
Страница 205: ......
Страница 206: ...8 Interrupt Control Unit...
Страница 207: ......
Страница 239: ...INTERRUPT CONTROL UNIT 8 32...
Страница 240: ...9 Timer Counter Unit...
Страница 241: ......
Страница 265: ......
Страница 266: ...10 Direct Memory Access Unit...
Страница 267: ......
Страница 295: ...DIRECT MEMORY ACCESS UNIT 10 28...
Страница 296: ...11 Math Coprocessing...
Страница 297: ......
Страница 314: ...12 ONCE Mode...
Страница 315: ......
Страница 318: ...A 80C186 Instruction Set Additions and Extensions...
Страница 319: ......
Страница 330: ...B Input Synchronization...
Страница 331: ......
Страница 334: ...C Instruction Set Descriptions...
Страница 335: ......
Страница 383: ...INSTRUCTION SET DESCRIPTIONS C 48...
Страница 384: ...D Instruction Set Opcodes and Clock Cycles...
Страница 385: ......
Страница 408: ...Index...
Страница 409: ......