MC68C812A4 Datasheet, PDF (13/18 Pages) Freescale Semiconductor, Inc – Technical Supplement MC68C812A4 3.3V Electrical Characteristics

Freescale Semiconductor, Inc.
Table 11 Peripheral Port Timing
Characteristic
Symbol
Frequency of operation (E-clock frequency)
E-clock period
Peripheral data setup time
MCU read of ports
Peripheral data hold time
MCU read of ports
t_PDSU = t_cyc/2 + 30
Delay time, peripheral data write
MCU write to ports
f_o
t_cyc
t_PDSU
t_PDH
t_PWD
5.0 MHz Unit
Min Max
dc 5.0 MHz
200 — ns
130 — ns
0
— ns
— 40 ns
ECLK
PORTS
ECLK
PORT A
MCU READ OF PORT
t_PDSU
t_PDH
Figure 6 Port Read Timing Diagram
MCU WRITE TO PORT
PORT RD TIM
PREVIOUS PORT DATA
t_PWD
Figure 7 Port Write Timing Diagram
NEW DATA VALID
PORT WR TIM
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