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參數(shù)資料
| 型號： | BP80C31BH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 12 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 842K |
| 代理商： | BP80C31BH |
AUTOMOTIVE 80C31BH/80C51BH/87C51
EPROM CHARACTERISTICS
(EPROM Only)
The 87C51 is programmed by a modified Quick-
Pulse Programming algorithm. It differs from older
methods in the value used for VPP (Programming
Supply Voltage) and in the width and number of the
ALE/PROG pulses.
The 87C51 contains two signature bytes that can be
read and used by an EPROM programming system
to identify the device. The signature bytes identify
the device as an 87C51 manufactured by Intel.
Table 3 shows the logic levels for reading the signa-
ture byte, and for programming the Program Memo-
ry, the Encryption Table, and the Lock Bits. The cir-
cuit configuration and waveforms for Quick-Pulse
Programming are shown in Figures 11 and 12. Fig-
ure 13 shows the circuit configuration for normal
Program Memory verification.
Table 3. EPROM Programming Modes
MODE
RST
PSEN
ALE/
EA/
P2.7
P2.6
P3.7
P3.6
PROG
VPP
Read Signature
1
0
1
0
Program Code Data
1
0
VPP
1011
Verify Code Data
1
0
1
0
1
Pgm Encryption Table
1
0
VPP
1010
Pgm Lock Bit 1
1
0
VPP
1111
Pgm Lock Bit 2
1
0
VPP
1100
NOTES
:
``1'' e Valid high for that pin
``0'' e Valid low for that pin
VPP e 12.75V g 0.25V
VCC e 5V g20% during programming and verification
ALE/PROG receives 25 programming pulses while VPP is held at 12.75V. Each programming pulse is low for 100 ms
(g10 ms) and high for a minimum of 10 ms.
270419±19
Figure 11. Programming Configuration
13
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