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7721 Datasheet(PDF) 80 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) 80 Page - Renesas Technology Corp

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CLOCK GENERATING CIRCUIT
7721 Group User’s Manual
5–3
5.2 Clocks
5.2 Clocks
Figure 5.2.1 shows the clock generating circuit block diagram.
Fig. 5.2.1 Clock generating circuit block diagram
Q
XIN
XOUT
1/2
R
S
Q
R
S
Q
R
S
1
CPU
1/8
1/2
f2
1/2
1/8
f16
f64
f512
f32
f512
Interrupt request
STP instruction
Reset
WIT instruction
Ready request
CPU wait request
from BIU
Operation clock for
internal peripheral devices
Watchdog
timer
CPU : Central Processing Unit
BIU : Bus Interface Unit
Watchdog timer frequency select bit : Bit 0 at address 6116
Note: This signal is generated when the watchdog timer’s most significant bit becomes “0.”
(Note)
Watchdog timer
frequency select bit
“0”
“1”
Bus request
DRAMC
Hold
DMAC



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