4 ac characteristics — serial port, shift regist, 5 external clock drive, Figure 17. serial port waveform — shift register m – Intel 8XC251SA User Manual
Page 31: Table 14. serial port timing — shift register mode, Table 15. external clock drive, Preliminary
PRELIMINARY
31
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
5.4
AC Characteristics — Serial Port, Shift Register Mode
Figure 17. Serial Port Waveform — Shift Register Mode
5.5
External Clock Drive
Table 14. Serial Port Timing — Shift Register Mode
Symbol
Parameter
Min
Max
Units
T
XLXL
Serial Port Clock Cycle Time
12T
OSC
ns
T
QVSH
Output Data Setup to Clock Rising Edge
10T
OSC
– 133
ns
T
XHQX
Output Data hold after Clock Rising Edge
2T
OSC
– 117
ns
T
XHDX
Input Data Hold after Clock Rising Edge
0
ns
T
XHDV
Clock Rising Edge to Input Data Valid
10T
OSC
– 133
ns
Table 15. External Clock Drive
Symbol
Parameter
Min
Max
Units
1/T
CLCL
Oscillator Frequency (F
OSC
)
16
MHz
T
CHCX
High Time
20
ns
T
CLCX
Low Time
20
ns
T
CLCH
Rise Time
10
ns
T
CHCL
Fall Time
10
ns
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
RXD
(In)
RXD
(Out)
TXD
0
1
2
3
4
5
6
7
TQVXH
TXLXL
TXHDX
TXHQX
TXHDV
A2592-02
Set TI
†
Set RI
†
TAV
†
†
TI and RI are set during S1P1 of the peripheral cycle following the shift of the eighth bit.