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Philips Semiconductors Product data sheet
SC28L91
3.3 V or 5.0 V Universal Asynchronous
Receiver/Transmitter (UART)
2004 Oct 21
33
RESETN
t
RES
SD00696
RESETN
t
RES
80XXX
Mode 68XXX
Mode
Figure 4. Reset Timing
A0–A3
CEN
t
AS
t
CS
t
CH
RDN
t
RW
t
RWD
D0–D7
(READ)
t
DD
t
DF
FLOAT FLOATVALID
NOT
VALID
WDN
t
RWD
VALID
D0–D7
(WRITE)
t
DS
t
DH
t
AH
SD00087
NOTE:
Bus action in the 80XXX mode terminates on the rise of CEN, WRN, or RDN which ever one occurs first.
Figure 5. Bus Timing (80XXX mode)