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7721 Datasheet(PDF) 397 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) 397 Page - Renesas Technology Corp

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WATCHDOG TIMER
7721 Group User’s Manual
15–2
15.1 Block description
Watchdog functions as follows:
q Detects a program runaway.
q Measures a certain time from when oscillation starts owing to terminating Stop mode.
(Refer to section “5.3 Stop mode.”)
15.1 Block description
Figure 15.1.1 shows the block diagram of Watchdog timer.
Fig. 15.1.1 Block diagram of Watchdog timer
2Vcc
detection
circuit
“FFF16”
is set.
Writing to watchdog timer
register (address 6016)
STP instruction
Bus request (Hold)
Watchdog timer
interrupt request
RESET
S
Q
R
f32
Watchdog timer
CPU wait request
f512
Bus request (DRAMC)
Bus request (DMAC)



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