UPD753012GC NEC, UPD753012GC Datasheet - Page 39

• Manufacturer Part Number: UPD753012GC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

9. RESET FUNCTION
watchdog timer. When either one of the reset signals are input, an internal reset signal is generated. Figure 9-
1 shows the circuit diagram of the above two inputs.
Figure 9-2 shows the timing chart of the reset operation.
There are two reset inputs: external reset signal (RESET) and reset signal sent from the basic interval timer/
The PD753017 is set by the RESET signal generated and each device is initialized as listed in Table 9-1.
Note The following two times can be selected by the mask option.
RESET
2
2
generated
17
15
RESET
/f
/f
signal
X
X
(21.8 ms : at 6.00 MHz operation, 31.3 ms : at 4.19 MHz operation)
(5.46 ms : at 6.00 MHz operation, 7.81 ms : at 4.19 MHz operation)
Figure 9-2. Reset Operation by RESET Signal Generation
Operation mode or
standby mode
Figure 9-1. Configuration of Reset Function
Internal bus
Internal reset operation
WDTM
HALT mode
Internal reset signal
Wait
PD753012, 753016, 753017
Note
Reset signal sent from the basic
interval timer/watchdog timer
Operation mode
39