Philips SC28L91 - Manual (Page 33)

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 FLOAT VALID
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)