參數(shù)資料
型號(hào): MC68HC705P6ACDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 86/130頁
文件大?。?/td> 1541K
代理商: MC68HC705P6ACDW
EPROM
Advance Information
MC68HC705P6A
Rev. 2.0
86
EPROM
MOTOROLA
To program a byte of EPROM, manipulate the EPROG register as
follows:
1.
Set the ELAT bit in the EPROG register.
2.
Write the desired data to the desired EPROM address.
3.
Set the EPGM bit in the EPROG register for the specified
programming time, tEPGM.
Clear the ELAT and EPGM bits in the EPROG register.
4.
This sequence is also shown in the sample program listing in
Table 10-1
.
10.7 EPROM Bootloader
Three port pins are associated with bootloader control functions: PC3,
PC4, and PC6.
Table 10-2
summarizes their functionality.
Table 10-1. EPROM Programming Routine
001C
0055
0700
0000
EPROG
DATA
EPROM
EPGM
EQU $1C
EQU $55
EQU $700
EQU $00
PROGRAMMING REG
DATA VALUE
A SAMPLE EPROM ADX
EPGM BIT IN EPROG REG
00D0
ORG
$D0
00D0
00D2
00D4
00D6
00D9
00DB
00DD
00DF
A6 02
B7 1C
A6 55
C7 07 00
10 1C
AD 03
3F 1C
81
LDA
STA
LDA
STA
BSET
BSR
CLR
RTS
#$04
EPROG
#DATA
EPROM
EPGM, EPROG
DELAY
EPROG
SET LAT BIT IN EPROG
DATA BYTE
WRITE IT TO EPROM LOC
TURN ON PGM VOLTAGE
WAIT 4 ms MINIMUM
CLR LAT AND PGM BITS
Table 10-2. Bootloader Control Pins
PC6
PC4
PC3
Mode
1
1
1
Program/verify
1
1
0
Verify only
1
0
0
Dump MCU EPROM to port A
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