80C554 Datasheet, PDF (69/76 Pages) NXP Semiconductors – 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP

Philips Semiconductors
80C51 8-bit microcontroller – 6 clock operation
16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I²C, PWM,
capture/compare, high I/O, 64L LQFP
Preliminary specification
80C554/83C554/87C554
ALE
PSEN
t_WHLH
WR
PORT 0
PORT 2
t_LLWL
t_WLWH
t_AVLL
t_LLAX
A0–A7
FROM RI OR DPL
t_AVWL
t_QVWX
t_DW
DATA OUT
P2.0–P2.7 OR A8–A15 FROM DPH
t_WHQX
A0–A7 FROM PCL
A8–A15 FROM PCH
Figure 51. External Data Memory Write Cycle
INSTR IN
SU00213
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE TO SBUF
INPUT DATA
CLEAR RI
V_CC–0.5
0.45V
0.7V_CC
0.2V_CC–0.1
t_CHCL
t_CLCX
t_CHCX
t_CLCH
t_CLCL
SU00009
Figure 52. External Clock Drive XTAL1
0
1
2
3
4
5
6
7
8
t_XLXL
t_QVXH
t_XHQX
0
t_XHDV
VALID
1
2
t_XHDX
VALID
VALID
3
VALID
4
VALID
Figure 53. Shift Register Mode Timing
5
VALID
6
VALID
7
SET TI
VALID
SET RI
SU00027
2000 Nov 10
69