UPD17217GT datasheet(48/84 Pages) NEC

48 / 84 page

µPD17215, 17216, 17217, 17218

The

µPD17215 oscillator circuit is stopped, when the STOP instruction has been executed (i.e., in the STOP mode).

Oscillation is not resumed, until the STOP mode is released. After the STOP mode has been released, the HALT mode

is set. Set the time required to release the HALT mode by using the timer with modulo function.

The time that elapses, after the STOP mode has been released by occurrence of an interrupt, until an operation mode

is set, is shown in the following table.

Time Required to Set Operation Mode

8-Bit Modulo Register Set Value

after STOP Mode Release

(TMM)

At 4 MHz

40H

4.160 ms (64

µs × 65)

FFH

16.384 ms (64

µs × 256)

Remark:

Set the 8-bit modulo timer before executing STOP instruction.

Caution:

Do not execute an instruction that clears the interrupt request flag (IRQxxx) for which the

interrupt enable flag (IPxxx) is set immediately before the STOP 8H instruction; otherwise, the

STOP mode may not be set.

Table 8-4

STOP Mode Releasing Conditions

Operand Value

Releasing Conditions

1000B (08H)

When any of P0A0-P0A3 and P0B0-P0B3 pins goes low

Others

Inhibited

UPD17217GT Datasheet(PDF) 48 Page - NEC