SC28L91 Philips Semiconductors, SC28L91 Datasheet - Page 34

• Manufacturer Part Number: SC28L91
• Description: 3.3V-5.0V Universal Asynchronous Receiver/Transmitter (UART)
• Manufacturer: Philips Semiconductors

Philips Semiconductors
NOTE:
2000 Sep 22
3.3V–5.0V Universal Asynchronous
Receiver/Transmitter (UART)
For Figures 6 and 7 WRN changing within the time of CEN low may cause short read or write pulses that could upset internal pointers and
registers. Bus action terminates on the rise of CEN or the fall of DACKN, which ever occurs first.
NOTE: DACKN low requires two rising edges of X1 clock after CSN is low.
NOTE: DACKN low requires two rising edges of X1 clock after CSN is low.
DTACKN
X1/CLK
DTACKN
D0–D7
A1–A4
X1/CLK
D0–D7
RWN
A1–A4
CSN
RWN
CSN
t
DA
Figure 6. Bus Timing (Read Cycle) (68XXX mode)
Figure 7. Bus Timing (Write Cycle) (68XXX mode)
t
t
AS
AS
t
CS
t
VALID
CS
t
t
NOT
CSC
DD
t
t
DS
CSC
t
AH
t
AH
t
DCW
t
DCR
34
DATA VALID
t
DAT
t
DAT
t
RWD
t
RWD
t
t
t
CH
t
CH
t
DAH
t
DF
DH
DAH
SD00687
SD00688
Product specification
SC28L91