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P87C554 Datasheet(PDF) 70 Page - NXP Semiconductors

Part # P87C554
Description  80C51 8-bit microcontroller - 12 clock operation 16K/512 OTP/RAM 8 channel 10-bit A/D, I2C, PWM, capture/compare, high I/O
PDF  77 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87C554 Datasheet(HTML) 70 Page - NXP Semiconductors

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Philips Semiconductors
Product data
P87C554
80C51 8-bit microcontroller – 12 clock operation
16K/512 OTP/RAM, 8 channel 10-bit A/D, I2C, PWM,
capture/compare, high I/O
2002 Mar 25
68
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 51. External Data Memory Write Cycle
VCC–0.5
0.45V
0.7VCC
0.2VCC–0.1
tCHCL
tCLCL
tCLCH
tCLCX
tCHCX
SU00009
Figure 52. External Clock Drive XTAL1
0
1
2
3
4
5
678
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE TO SBUF
INPUT DATA
CLEAR RI
SET TI
SET RI
tXLXL
tQVXH
tXHQX
tXHDX
tXHDV
SU00027
12
3
0
456
7
VALID
VALID
VALID
VALID
VALID
VALID
VALID
VALID
Figure 53. Shift Register Mode Timing



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