NEC PD750008 User Manual

The µPD750008 is reset with the external reset signal (RESET) or the reset signal received from the basic

interval timer/watchdog timer.  When either reset signal is input, the internal reset signal is generated.  Figure

8-1 shows the configuration of the reset circuit.

When the RESET signal is generated,  all hardware is initialized as indicated in Table 8-1.  Figure 8-2 shows

the reset operation timing.

Note The following two wait times can be selected by a mask option:

2

17

/f

X

 (21.8 ms at 6.00 MHz, 31.3 ms at 4.19 MHz)

2

15

/f

X

 (5.46 ms at 6.00 MHz, 7.81 ms at 4.19 MHz)

However, the µPD75P0016 dose not have a mask option and its wait time is fixed to 2

15

/f

X

.

WDTM

RESET

Internal reset signal

Reset signal from basic
interval timer/watchdog timer

Internal bus

RESET signal is generated

Operating mode or 
standby mode

HALT mode

Operating mode

Internal reset operation

Wait

*