Z51F3220FNX Datasheet, PDF (274/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
12. Power Down Operation
12.1 Overview
The Z51F3220 has two power-down modes to minimize the power consumption of the device. In power down
mode, power consumption is reduced considerably. The device provides three kinds of power saving functions,
Main-IDLE, Sub-IDLE and STOP mode. In three modes, program is stopped.
12.2 Peripheral Operation in IDLE/STOP Mode
Table 12-1 Peripheral Operation during Power Down Mode
Peripheral
CPU
RAM
Basic Interval Timer
Watch Dog Timer
Watch Timer
IDLE Mode
ALL CPU Operation are Disable
Retain
Operates Continuously
Operates Continuously
Operates Continuously
Timer0~4
Operates Continuously
ADC
BUZ
SPI
USI0/1
LCD Controller
Internal OSC
(16MHz)
WDTRC OSC
(5kHz)
Main OSC
(0.4~12MHz)
Sub OSC
(32.768kHz)
I/O Port
Control Register
Address Data Bus
Operates Continuously
Operates Continuously
Operates Continuously
Operates Continuously
Operates Continuously
Oscillation
Stop
Oscillation
Oscillation
Retain
Retain
Retain
Release Method By RESET, all Interrupts
STOP Mode
ALL CPU Operation are Disable
Retain
Stop
Stop (Can be operated with WDTRC OSC)
Stop (Can be operated with sub clock)
Halted (Only when the Event Counter Mode is
Enabled, Timer operates Normally)
Stop
Stop
Only operate with external clock
Only operate with external clock
Stop (Can be operated with sub clock)
Stop when the system clock (fx) is fIRC
Can be operated with setting value
Stop when fx = fXIN
Stop when fx = fSUB
Retain
Retain
Retain
By RESET, Timer Interrupt (EC0, EC1, EC3),
SPI (External clock), External Interrupt,
UART by ACK, WT (sub clock), WDT
PS029902-0212
PRELIMINARY
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