參數(shù)資料
型號: MC68HC05L1B
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝: SDIP-56
文件頁數(shù): 83/102頁
文件大?。?/td> 632K
代理商: MC68HC05L1B
MC68HC05L1
MOTOROLA
10-5
OPERATING MODES
10
EPGM - EPROM Program Command
1 (set)
Programming power connected to the EPROM array. If LATA
≠ 1 then
EPGM = 0.
0 (clear) –
Programming power disconnected from the EPROM array.
10.3.3
EPROM Programming Sequence
Programming the EPROM of the MC68HC705L1 is as follows:
1) Set the LATA bit.
2) Write the data to be programmed to the address to be programmed.
3) Set the EPGM bit.
4) Delay for 1ms.
5) Clear the EPGM and the LATA bits.
The last action may be carried out in a single CPU write operation. It is important to remember
that an external programming voltage must be applied to the VPP pin while programming, but
should be equal to VDD during normal operation.
Example shows address $1000 is programmed with $00.
CLR
PCR
;reset PCR
LDX
#$00
;load index register with 00
BSET
1,PCR
;set LATA bit
LDA
#$00
;load data = 00 in to A
STA
$1000,X
;latch data and address
BSET
0,PCR
;program
JSR
DELAY
;call delay subroutine for 1ms
CLR
PCR
;reset PCR
TPG
79
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