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参数资料
| 型号： | BN87C51FC-20 |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 6/18页 |
| 文件大小： | 1527K |
| 代理商： | BN87C51FC-20 |
AUTOMOTIVE 87C51FA/FB/FC/FC-20
AC TESTING INPUT, OUTPUT WAVEFORMS
270961±17
AC Inputs during testing are driven at VCCb0.5V for a Logic ``1''
and 0.45V for a Logic ``0''. Timing measurements are made at VIH
min for a Logic ``1'' and VIL max for a Logic ``0''.
FLOAT WAVEFORMS
270961±18
For timing purposes a port pin is no longer floating when a
100 mV change from load voltage occurs, and begins to float
when a 100 mV change from the loaded VOH/V OL level occurs.
IOL/I OH t g20 mA.
Table 3. 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
H
Verify Code Data
H
L
H
L
H
Program Encryption
H
L
12.75V
L
H
L
H
Array Address 0±3FH
Program Lock
Bit 1
H
L
12.75V
H
Bits
Bit 2
H
L
12.75V
H
L
Bit 3
H
L
12.75V
H
L
H
L
Read Signature Byte
H
L
H
L
DEFINITION OF TERMS
(EPROM PROGRAMMING)
ADDRESS LINES: P1.0±P1.7, P2.0±P2.5, P3.4±
P3.5 respectively for A0±A13.
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
PROGRAMMING THE EPROM
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 3. 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 re-
turned 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.
14
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