參數(shù)資料
型號: MC68HC05BS8FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 27/128頁
文件大?。?/td> 752K
代理商: MC68HC05BS8FB
MOTOROLA
A-4
MC68HC05BS8
MC68HC705BS8
A
A.4.1
Program Control Register (PCR)
ELAT - EPROM Latch Control
1 (set)
EPROM address and data bus congured for programming (writes to
EPROM cause address data to be latched). EPROM is in
programming mode and cannot be read if ELATA is 1. This bit should
not be set unless a programming voltage is applied to the VPP pin.
0 (clear) –
EPROM address and data bus congured for normal reads.
PGM - EPROM Program Command
1 (set)
Programming power connected to the EPROM array. If ELAT
≠ 1 then
PGM = 0.
0 (clear) –
Programming power disconnected from the EPROM array.
A.4.2
EPROM Programming Sequence
Programming the EPROM of the MC68HC705BS8 is as follows:
1) Set the ELAT bit.
2) Write the data to be programmed to the address to be programmed.
3) Set the PGM bit.
4) Delay for 1ms.
5) Clear the PGM and the ELAT 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 $1900 is programmed with $00.
CLR
PCR
;reset PCR
LDX
#$00
;load index register with 00
BSET
1,PCR
;set ELAT bit
LDA
#$00
;load data = 00 in to A
STA
$1900,X
;latch data and address
BSET
0,PCR
;program
JSR
DELAY
;call delay subroutine for 1ms
CLR
PCR
;reset PCR
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$001C
RESERVED
ELAT
PGM
uuuu uu00
TPG
120
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