參數(shù)資料
型號(hào): 21825
英文描述: 3.3V Spread-Spectrum EconOscillator
中文描述: 內(nèi)存管理使用16位ROMCS設(shè)計(jì)呢?lanSC300和?lanSC310微控制器
文件頁(yè)數(shù): 2/4頁(yè)
文件大小: 64K
代理商: 21825
2
Using 16-Bit ROMCS
Designs in élan
TM
SC300 and élanSC310 Microcontrollers
Reset Code Example
code segment
assume cs: code
org
0ffd7h
fetching 16:
;when we reach here, we’re fetching 16 bits,
;so we can use normal instructions to jump to
;the real boot code
db
dw
0eah
0, 0f000h
;jmp to real start of code
;wherever that may be
org
0ffdch
;must be located at 0ffdch
;this code is set up so the even and odd bytes are duplicates
;this code just puts 04B3 in ax and outputs ax to port 22h
;this sets bit 2 of index register B3, enabling ROMCS
;to be an address decode and not gated with MEMR/MEMW
;ODD EVEN
db
0b4h
;B4
duplicate of mov ah opcode
fetching8:
;
this location must be at FFDD
mov
ah, 004h
;B4 04
add
al, 0b0h
;B4 B0
harmless, sets up next instruction
mov
al, 0b3h
;B0 B3
mov
bl, 0e7h
;B3 E7
harmless, sets up next instruction
out
022h, ax
;E7 22
and
ch, bl
;22 EB
harmless, sets up jump short instruction
jmp
short fetching 16 ;EB EC
the fetches done at the target of this
jump will be 16 bits
db
EC
;EC
this code never gets executed so its
contents do not matter
nop
nop
nop
nop
org 0fff0h
;
reset vector
reset_vector:
jmp
short fetching8
;EB EB
jumps to FFDD
code ends
end
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