MC81F4104M datasheet(93/118 Pages) FINECHIPS

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MC81F4104M Datasheet(PDF) 93 Page - Finechips

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MC81F4104

October 19, 2009 Ver.1.35

Release the STOP mode

The source for exit from STOP mode is hardware reset, external interrupt, Timer(EC2,3). Reset re-

defines all the Control registers but does not change the on-chip RAM. External interrupts allow both

on-chip RAM and Control registers to retain their values.

If I-flag = 1, the normal interrupt response takes place. If I-flag = 0, the chip will resume execution

starting with the instruction following the STOP instruction. It will not vector to interrupt service routine.

(refer to Figure 21-3) When exit from Stop mode by external interrupt, enough oscillation stabilization

time is required to normal operation. Figure 21-4 shows the timing diagram. When released from the

Stop mode, the Basic interval timer is activated on wake-up. It is increased from 00H until FFH. The

count overflow is set to start normal operation. Therefore, before STOP instruction, user must be set

its relevant prescaler divide ratio to have long enough time (more than 20msec). This guarantees that

oscillator has started and stabilized. By reset, exit from Stop mode is shown in Figure 21-5.

Figure 21-3 STOP Releasing Flow by Interrupts

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Finechips	MC81F4204	3Mb / 150P	ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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	MC81F4204R	3Mb / 150P	ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

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