
8- 16
MC68306 USER'S MANUAL
MOTOROLA
8.12 SERIAL MODULE AC ELECTRICAL CHARACTERISTICS—CLOCK
TIMING (See Figure 8-12.)
Characteristic
Symbol
Min
Max
Unit
Counter/Timer Clock High or Low Time
tCTC
25
—
ns
Clock Rise Time
tr
—20
ns
Clock Fall Time
tf
—20
ns
t
f
t
r
t CLK
t CTC
t CLK
t CTC
X1/CLK
IP2 FOR C/T CLK
Figure 8-12. Clock Timing
8.13 AC ELECTRICAL CHARACTERISTICS—PORT TIMING
(See Figure 8-13 and Note.)
Characteristic
Symbol
Min
Max
Unit
Port Input Setup Time to LDS Asserted
tPS
0—
ns
Port Input Hold Time from LDS Negated
tPH
0—
ns
Port Output Valid from LDS Negated
tPD
—60
ns
NOTE: Test conditions for port outputs: CL = 50 pF, RL = 27 k to VCC.
t
PS
LDS
OP0, OP1, OP3
IP0-IP2
OLD DATA
NEW DATA
t
PD
t
PH
Figure 8-13. Port Timing
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Freescale Semiconductor, Inc.
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