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7721 Datasheet(PDF) 447 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 447 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–44
16.2 Examples of using DMA controller
Fig. 16.2.1 Example of Centronics interface configuration
Data bus
DMAREQ0
TA3OUT (one-shot output)
TA3IN
DMAACK0
TA2IN
P43
TA2OUT (one-shot output)
M37721
Octal latch
AC574
OC
T
Q
D
S
T
Data
D-F/F
CS
RD
STB
BUSY
ACK
XIN
XOUT
25 MHz
DMAACK0
TA2OUT
TA3OUT
ACK
BUSY
T2
T3
T2 : Timer A2’s set time
T3 : Timer A3’s set time
____
Fig. 16.2.2 Relationship between ACK and BUSY



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