參數(shù)資料
型號(hào): HC05V7GRS
英文描述: 68HC05V7 General Release Specification
中文描述: 68HC05V7一般版本規(guī)范
文件頁數(shù): 37/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
SECTION 3: EPROM and EEPROM
MOTOROLA
Page 23
whether to erase a byte before programming is summarized in Table 3-2.
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
TCNTH
TCNTL
TCMPH
TCMPL
OCF
PROG
CPEN
ER1
ER0
LATCH
EERC
EEPGM
EESTART EQU
SUMPIN
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
$0013
$0018
$0019
$0016
$0017
6
$001C
6
4
3
2
1
0
$0240
$FF
TIMER STATUS REGISTER
TIMER COUNTER REGISTER (HIGH)
TIMER COUNTER REGISTER (LOW)
TIMER OUTPUT COMPARE REGISTER (HIGH)
TIMER OUTPUT COMPARE REGISTER (LOW)
OCF BIT OF TSR
PROGRAM REGISTER
CHARGE PUMP ENABLE
ERASE SELECT 1
ERASE SELECT 0
LATCH BIT
RC/OSC SELECTOR
EE PROGRAM BIT
STARTING ADDRESS OF EEPROM
DUMMY DATA
EQU
ORG
START
$1800
EQU
BSET
BSR
*
EERC,PROG
DELAY
SELECT RC OSC
RC OSC STABILIZATION
Table 3-2: EEPROM Write/Erase Cycle Reduction
EEPROM Data To Be
Programmed
EEPROM Data Before
Programming
Erase Before
Programming
0
0
No
0
1
No
1
0
Yes
1
1
No
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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