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參數資料
| 型號： | 89C4051 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-Bit Microcontroller with 4K Bytes Flash |
| 中文描述： | 8位4K字節(jié)閃存微控制器 |
| 文件頁數： | 7/15頁 |
| 文件大?。?/td> | 265K |
| 代理商： | 89C4051 |
AT89C4051
7
Reading the Signature Bytes:
The signature bytes are
read by the same procedure as a normal verification of
locations 000H, 001H, and 002H, except that P3.5 and
P3.7 must be pulled to a logic low. The values returned are
as follows.
(000H) = 1EH indicates manufactured by Atmel
(001H) = 41H indicates 89C4051
Programming Interface
Every code byte in the Flash array can be written and the
entire array can be erased by using the appropriate combi-
nation of control signals. The write operation cycle is self-
timed and once initiated, will automatically time itself to
completion.
All major programming vendors offer worldwide support for
the Atmel microcontroller series. Please contact your local
programming vendor for the appropriate software revision.
Flash Programming Modes
Notes:
1. The internal PEROM address counter is reset to 000H on the rising edge of RST and is advanced by a positive pulse at
XTAL 1 pin.
2. Chip Erase requires a 10-ms PROG pulse.
3. P3.1 is pulled Low during programming to indicate RDY/BSY.
Mode
Write Code Data
(1)(3)
RST/VPP
P3.2/PROG
P3.3
P3.4
P3.5
P3.7
12V
L
H
H
H
Read Code Data
(1)
H
H
L
L
H
H
Write Lock
Bit - 1
12V
H
H
H
H
Bit - 2
12V
H
H
L
L
Chip Erase
12V
H
L
L
L
Read Signature Byte
H
H
L
L
L
L
(2)
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