參數(shù)資料
型號(hào)： MC68HC705V8CB
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝： SDIP-56
文件頁數(shù)： 108/172頁
文件大?。?/td> 615K
代理商： MC68HC705V8CB
SECTION 3: EPROM AND EEPROM
MOTOROLA
Page 29
MC68HC705V8 Specification Rev. 2.1
To erase a byte of EEPROM set LATCH = 1, CPEN = 1, ER1 = 0 and ER0 = 1, write to the
address to be erased, and set EEPGM for a time t
EBYT.
To erase a block of EEPROM set LATCH = 1, CPEN = 1, ER1 = 1 and ER0 = 0, write to
any address in the block, and set EEPGM for a time t
EBLOCK.
For a bulk erase set LATCH = 1, CPEN = 1, ER1 = 1, and ER0 = 1, write to any address
in the array, and set EEPGM for a time t
EBULK.
To terminate the programming or erase sequence, clear EEPGM, delay for a time t
FPV to
allow the programming voltage to fall, and then clear LATCH and CPEN to free up the
buses. Following each erase or programming sequence, clear all programming control bits.
The following program is an example of the EEPROM programming sequence using the
timer to implement the required delay and assuming a 2.1 MHz bus frequency.
TSR
EQU
$0013
TIMER STATUS REGISTER
TCNTH
EQU
$0018
TIMER COUNTER REGISTER (HIGH)
TCNTL
EQU
$0019
TIMER COUNTER REGISTER (LOW)
TCMPH
EQU
$0016
TIMER OUTPUT COMPARE REGISTER (HIGH)
TCMPL
EQU
$0017
TIMER OUTPUT COMPARE REGISTER (LOW)
OCF
EQU
6
OCF BIT OF TSR
PROG
EQU
$001C
PROGRAM REGISTER
CPEN
EQU
6
CHARGE PUMP ENABLE
ER1
EQU
4
ERASE SELECT 1
ER0
EQU
3
ERASE SELECT 0
LATCH
EQU
2
LATCH BIT
EERC
EQU
1
RC/OSC SELECTOR
EEPGM
EQU
0
EE PROGRAM BIT
EESTART EQU
$0240
STARTING ADDRESS OF EEPROM
SUMPIN
EQU
$55
DUMMY DATA
ORG
$0F00
START
EQU
*
BSET
EERC,PROG
SELECT RC OSC
BSR
DELAY
RC OSC STABILIZATION
BSET
CPEN,PROG
TURN ON CHARGE PUMP
BSET
LATCH,PROG
ENABLE LATCH BIT
Table 3-3:
EEPROM Write/Erase Cycle Reduction
EEPROM Data To Be
Programmed
EEPROM Data Before
Programming
Erase Before
Programming?
00
No
01
No
10
Yes
11
No
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