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MC97F6108A User’s manual 20. Electrical characteristics
227
20.14 USART characteristics
Table 51. USART Characteristics
(T
A
= -40°C ~ +85°C, VDD=2.7V ~ 5.5V, f
IRC
=8MHz)
Parameter Symbol MIN TYP MAX Unit
Serial port clock cycle time t
SCK
1800 t
CPU
x 16 2200 ns
Output data setup to clock rising edge t
S1
8100 t
CPU
x 13 – ns
Clock rising edge to input data valid t
S2
– – 590 ns
Output data hold after clock rising edge t
H1
t
CPU
- 50 t
CPU
– ns
Input data hold after clock rising edge t
H2
0 – – ns
Serial port clock High, Low level width t
HIGH
, t
LOW
720 t
CPU
x 8 1280 ns
t
HIGH
t
LOW
t
SCK
Figure 109. Waveform for USART Timing Characteristics
Shift Clock
Data Out D1 D2 D3 D4 D5 D6 D7 D0
Valid Data In Valid Valid Valid Valid Valid Valid Valid
t
SCK
t
S1
t
H1
t
H2
t
S2
Figure 110. Timing Waveform for the USART Module