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參數(shù)資料
| 型號： | MC68HC05G1B |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | SDIP-56 |
| 文件頁數(shù)： | 124/124頁 |
| 文件大小： | 732K |
| 代理商： | MC68HC05G1B |
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MC68HC05G1
MOTOROLA
11-1
LOW POWER MODES
11
LOW POWER MODES
The MC68HC05G1 has two low power modes, Stop and Wait. These two modes have different
effects on the Programmable Timer, Real Time Clock, and Serial Peripheral Interface.
11.1
Stop Mode
The Stop mode is entered when the processor executes the STOP instruction. This places the
MC68HC05G1 in its lowest power consumption mode. In Stop mode the internal processor clock
is turned off, causing all internal processing to be halted (see Stop mode owchart in Figure 11-1).
Entering Stop mode, the I bit (interrupt mask) in the condition code register is cleared to enable
external interrupts (IRQ, INT1 & INT2) and RTC interrupt. All other registers and memory remain
unaltered and all input/output lines remain unchanged. The RTC will keep running if the
STPOSC=0 (32KHz oscillator kept running) in the PLL Status and Control register. Setting the
STPOSC bit before entering Stop mode, the RTC will stop. Stop mode is exited by an external
interrupt (IRQ, INT1 & INT2), RTC interrupt, or external RESET. On exit, the internal processor
clock is then turned on and the MCU will wait for 16 cycles of 32KHz clock if the 32KHz oscillator
has been kept running continuously. Otherwise the 32KHz oscillator should be turned on and, like
Power-On-Reset, the MCU operation is halted for 4064 cycles of 32KHz clock to ensure a stable
crystal oscillation. This latter case will happen if the interrupt is an external reset. The program
counter is vectored to memory locations containing the start address of the interrupt or reset
service routine.
The effects of Stop mode on the programmable Timer, RTC, and SPI are described below.
TPG
95
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