M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 253

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.2 Operation description
The operation of Watchdog timer is described below.
9.2.1 Basic operation
The watchdog timer interrupt is a nonmaskable interrupt. When the watchdog timer interrupt request is
accepted, the processor interrupt priority level (IPL) is set to “111
interrupt request occurs. (Refer to Table 9.2.1.)
When the Watchdog timer’s most significant bit becomes “0” (counted 2048 times), the watchdog timer
When the interrupt request occurs at above
Watchdog timer starts down-counting from “FFF
7702/7703 Group User’s Manual
, a value “FFF
16
.”
Table 9.2.1 Occurrence interval of watchdog timer
frequency select bit
Watchdog timer
0
1
16
WATCHDOG TIMER
” is set to Watchdog timer.
interrupt request
2
.”
9.2 Operation description
Count source
f
f
512
32
f(X
IN
) = 25 MHz
Occurrence interval
41.94 ms
2.62 ms
9–5