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87C524 Datasheet(PDF) 15 Page - NXP Semiconductors

Part # 87C524
Description  80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

87C524 Datasheet(HTML) 15 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
87C524/87C528
80C51 8-bit microcontrollers
16K/32K, 512 OTP, I2C, watchdog timer
1999 Jul 23
15
tLLAX
ALE
PSEN
PORT 0
PORT 2
WR
A0–A7
FROM RI OR DPL
DATA OUT
A0–A7 FROM PCL
INSTR IN
P2.0–P2.7 OR A8–A15 FROM DPF
A0–A15 FROM PCH
tWHLH
tLLWL
tWLWH
tAVLL
tAVWL
tQVWX
tWHQX
SU00069
Figure 3. External Data Memory Write Cycle
0
1
2
3
4
5
678
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE TO SBUF
INPUT DATA
CLEAR RI
VALID
VALID
VALID
VALID
VALID
VALID
VALID
VALID
SET TI
SET RI
tXLXL
tQVXH
tXHQX
tXHDX
tXHDV
SU00027
12
3
0
456
7
Figure 4. Shift Register Mode Timing


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