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Rev. 5.00, 09/03, page 708 of 760
t
SCYC
t
TXD
SCK
TxD
(data trans-
missiion)
RxD
(data
reception)
t
RXH
t
RXS
t
RTSD
RTS
CTS
t
CTSH
t
CTSS
Figure 23.51 SCI I/O Timing in Clock Synchronous Mode
t
PORTS1
CKIO
PORT 7 to 0
(read)
(B:P clock ratio = 1:1)
PORT 7 to 0
(read)
(B:P clock ratio = 4:1)
t
PORTH1
t
PORTS2
PORT 7 to 0
(read)
(B:P clock ratio = 2:1)
t
PORTH2
t
PORTS3
t
PORTH3
PORT 7 to 0
(write)
t
PORTD
Figure 23.52 I/O Port Timing
D
REQn
CKIO
t
DREQS
t
DREQH
Figure 23.53 D
DD
DR
RR
RE
EE
EQ
QQ
Q Input Timing