scn68681 NXP Semiconductors, scn68681 Datasheet - Page 19

• Manufacturer Part Number: scn68681
• Description: Dual Asynchronous Receiver/transmitter Duart
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2004 Mar 02
Dual asynchronous receiver/transmitter (DUART)
DACKN requires two rising edges of X1 clock after CEN is low.
NOTE:
RESETN
Figure 3. Reset Timing
DTACKN
X1/CLK
DTACKN
A1–A4
D0–D7
X1/CLK
A1–A4
D0–D7
RWN
CSN
t
RWN
RES
CSN
SD00109
t
AS
t
AS
Figure 5. Bus Timing (Write Cycle)
Figure 4. Bus Timing (Read Cycle)
t
AH
t
RWS
t
t
t
AH
CSC
RWS
t
t
t
DD
DS
CSC
t
DAL
t
DCW
t
DCR
19
t
CSD
t
CSD
t
DAT
t
DAT
t
CSW
t
CSW
t
t
t
t
RWH
t
DAH
t
RWH
DF
DH
DAH
SD00110
SD00111
SCN68681
Product data