
Electrical Characteristics
M68HC11E Family Data Sheet, Rev. 5.1
162
Freescale Semiconductor
10.11 Peripheral Port Timing
Characteristic(1) (2)
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Ports C and D timing is valid for active drive. (CWOM and DWOM bits are not set in PIOC and SPCR registers, respec-
tively.)
Symbol
1.0 MHz
2.0 MHz
3.0 MHz
Unit
Min
Max
Min
Max
Min
Max
Frequency of operation
E-clock frequency
fo
dc
1.0
dc
2.0
dc
3.0
MHz
E-clock period
tCYC
1000
—
500
—
333
—
ns
Peripheral data setup time
MCU read of ports A, C, D, and E
tPDSU
100
—
100
—
100
—
ns
Peripheral data hold time
MCU read of ports A, C, D, and E
tPDH
50
—
50
—
50
—
ns
Delay time, peripheral data write
tPWD = 1/4 tCYC+ 100 ns
MCU writes to port A
MCU writes to ports B, C, and D
tPWD
—
200
350
—
200
225
—
200
183
ns
Port C input data setup time
tIS
60
—
60
—
60
—
ns
Port C input data hold time
tIH
100
—
100
—
100
—
ns
Delay time, E fall to STRB
tDEB = 1/4 tCYC+ 100 ns
tDEB
—
350
—
225
—
183
ns
Setup time, STRA asserted to E fall(3)
3. If this setup time is met, STRB acknowledges in the next cycle. If it is not met, the response may be delayed one more cycle.
tAES
0—0—0—
ns
Delay time, STRA asserted to port C data output valid
tPCD
—
100
—
100
—
100
ns
Hold time, STRA negated to port C data
tPCH
10
—
10
—
10
—
ns
3-state hold time
tPCZ
—
150
—
150
—
150
ns