Z51F3220FNX Datasheet, PDF (275/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
12.3 IDLE Mode
The power control register is set to ‘01h’ to enter the IDLE Mode. In this mode, the internal oscillation circuits
remain active. Oscillation continues and peripherals are operated normally but CPU stops. It is released by reset
or interrupt. To be released by interrupt, interrupt should be enabled before IDLE mode. If using reset, because
the device becomes initialized state, the registers have reset value.
OSC
CPU Clock
External
Interrupt
Normal Operation
Release
Stand-by Mode
Normal Operation
Figure 12.1 IDLE Mode Release Timing by External Interrupt
PS029902-0212
PRELIMINARY
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