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87C552 Datasheet(PDF) 14 Page - NXP Semiconductors

Part # 87C552
Description  80C51 8-bit microcontroller 8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

87C552 Datasheet(HTML) 14 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
87C552
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O
1998 May 01
14
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 DPH
A8–A15 FROM PCH
tWHLH
tLLWL
tWLWH
tAVLL
tAVWL
tQVWX
tWHQX
tDW
SU00213
Figure 4. External Data Memory Write Cycle
0.8V
tLOW
tHIGH
VIH1
VIH1
0.8V
tCLCL
tr
tf
VIH1
VIH1
0.8V
0.8V
SU00214
Figure 5. External Clock Drive XTAL1
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 6. Shift Register Mode Timing


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