CHIP-SELECT UNIT
6-22
Example 6-1. Initializing the Chip-Select Unit (Continued)
mov
dx, MPCS_REG
;ready for PCS lines 4-6
mov
ax, MPCS_VAL
;as well as MCS programming
out
dx, al
mov
dx, MMCS_REG
;set up DRAM chip-selects
mov
ax, MMCS_VAL
out
dx, al
mov
dx, PACS_REG
;set up I/O chip-select
mov
ax, PACS_VAL
out
dx, al
CODE
ENDS
;
;Power-on reset code to get started
;
ASSUME
CS:POWER_ON
POWER_ON SEGMENT AT 0FFFFH
mov
dx, UMCS_REG
;point to UMCS register
mov
ax, UMCS_VAL
;reprogram UMCS to match system
out
dx, al
;requirements
jmp
FW_START
;jump to initialization code
POWER_ON
ENDS
;
;Data segment
;
DATA
SEGMENT PUBLIC 'DATA'
DD
256 DUP (?)
;reserved for interrupt vectors
;Place memory variables here
DW
500 DUP (?)
;stack allocation
STACK_TOP
LABEL
WORD
DATA
ENDS
;Program ends
END
Содержание 80C186XL
Страница 1: ...80C186XL 80C188XL Microprocessor User s Manual...
Страница 2: ...80C186XL 80C188XL Microprocessor User s Manual 1995...
Страница 18: ...1 Introduction...
Страница 19: ......
Страница 27: ......
Страница 28: ...2 Overview of the 80C186 Family Architecture...
Страница 29: ......
Страница 79: ......
Страница 80: ...3 Bus Interface Unit...
Страница 81: ......
Страница 127: ......
Страница 128: ...4 Peripheral Control Block...
Страница 129: ......
Страница 137: ......
Страница 138: ...5 ClockGenerationand Power Management...
Страница 139: ......
Страница 154: ...6 Chip Select Unit...
Страница 155: ......
Страница 178: ...7 Refresh Control Unit...
Страница 179: ......
Страница 193: ......
Страница 194: ...8 Interrupt Control Unit...
Страница 195: ......
Страница 227: ......
Страница 228: ...9 Timer Counter Unit...
Страница 229: ......
Страница 253: ......
Страница 254: ...10 Direct Memory Access Unit...
Страница 255: ......
Страница 283: ......
Страница 284: ...11 Math Coprocessing...
Страница 285: ......
Страница 302: ...12 ONCE Mode...
Страница 303: ......
Страница 306: ...A 80C186 Instruction Set Additions and Extensions...
Страница 307: ......
Страница 318: ...B Input Synchronization...
Страница 319: ......
Страница 322: ...C Instruction Set Descriptions...
Страница 323: ......
Страница 371: ......
Страница 372: ...D Instruction Set Opcodes and Clock Cycles...
Страница 373: ......
Страница 396: ...Index...
Страница 397: ......