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參數資料
| 型號： | MC68HC05BD3 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 103/112頁 |
| 文件大小： | 676K |
| 代理商： | MC68HC05BD3 |
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MC68HC05BD3
MOTOROLA
14-3
MC68HC705BD3
14
14.3.1
Programming Control Register (PCR)
The EPROM Programming Control register controls the actual programming of the EPROM in the
MC68HC705BD3.
ELAT - EPROM Latch Control
1 (set)
–
EPROM address and data bus configured for programming (writes to
EPROM cause address data to be latched). EPROM is in
programming mode and cannot be read if ELAT is 1. This bit is not
able be set when no V
PP
voltage is applied to the V
PP
pin.
0 (clear) –
EPROM address and data bus configured for normal reads.
PGM - EPROM Program Command
1 (set)
–
Programming power switched on to EPROM array. If ELAT
≠
1 then
PGM=0.
0 (clear) –
Programming power switched off to EPROM array.
14.3.2
EPROM Programming Sequence
Programming the EPROM of the MC68HC705BD3 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 the appropriate amount of time.
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 V
PP
pin while programming, but
should be equal to V
DD
during normal operation.
Example shows address $2000 is programmed with $00.
CLR
LDX
BSET
LDA
STA
PCR
#$00
1,PCR
#$00
$2000,X
;reset PCR
;load index register with 00
;set ELAT bit
;load data=00 in to A
;latch data and address
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$001D
ELAT
PGM
---- --00
TPG
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