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参数资料
| 型号： | S80C31BH |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 12 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 9/21页 |
| 文件大小： | 2233K |
| 代理商： | S80C31BH |
87C51/80C51BH/80C31BH
PROGRAMMING THE 87C51
The part must be running with a 4 MHz to 6 MHz
oscillator. The address of an EPROM location to be
programmed is applied to address lines while the
code byte to be programmed in that location is ap-
plied to data lines. Control and program signals must
be held at the levels indicated in Table 4. Normally
EA/V PP is held at logic high until just before
ALE/PROG is to be pulsed. The EA/V PP is raised to
VPP, ALE/PROG is pulsed low and then EA/V PP is
returned to a high (also refer to timing diagrams).
NOTE
:
Exceeding the VPP maximum for any amount of
time could damage the device permanently. The
VPP source must be well regulated and free of
glitches.
DEFINITION OF TERMS
ADDRESS LINES
: P1.0±P1.7, P2.0±P2.5, P3.4 re-
spectively for A0±A14.
DATA LINES
: P0.0±P0.7 for D0±D7.
CONTROL SIGNALS
: RST, PSEN, P2.6, P2.7, P3.3,
P3.6, P3.7.
PROGRAM SIGNALS
: ALE/PROG ,EA/V PP.
Table 4. EPROM Programming Modes
Mode
RST
PSEN
ALE/
EA/
P2.6
P2.7
P3.3
P3.6
P3.7
PROG
VPP
Program Code Data
H
L
12.75V
L
HHHH
Verify Code Data
H
L
H
L
H
Program Encryption
H
L
12.75V
L
H
L
H
Array Address 0±3F
Program Lock Bits
Bit 1
H
L
12.75V
HHHHH
Bit 2
H
L
12.75V
H
L
Bit 3
H
L
12.75V
H
L
H
L
Read Signature Byte
H
L
H
LLLLL
272335±21
See Table 4 for proper input on these pins
Figure 10. Programming the EPROM
17
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