MC68HC05C8A Datasheet, PDF (53/158 Pages) Motorola, Inc – Microcontrollers

Low-Power Modes
Stop Recovery
unaltered. All input/output lines remain unchanged. The processor can
be brought out of stop mode only by an external interrupt or reset.
6.4 Stop Recovery
The processor can be brought out of stop mode only by an external
interrupt or reset. See Figure 6-2.
6.5 Wait Mode
The WAIT instruction places the MCU in a low-power consumption
mode, but the wait mode consumes more power than the stop mode. All
CPU action is suspended, but the timer, serial communications interface
(SCI), serial peripheral interface (SPI), and the oscillator remain active.
Any interrupt or reset will cause the MCU to exit wait mode.
During wait mode, the I bit in the CCR is cleared to enable interrupts. All
other registers, memory, and input/output lines remain in their previous
state. The timer may be enabled to allow a periodic exit from wait mode.
OSC1(1)
RESET
IRQ(2)
IRQ(3)
tRL
tILIH
tILCH
4064 tcyc
INTERNAL CLOCK
INTERNAL ADDRESS BUS
Notes:
1. Represents the internal gating of the OSC1 pin
2. IRQ pin edge-sensitive option
3. IRQ pin level and edge sensitive option
1FFE 1FFE 1FFE 1FFE 1FFF
RESET ($1FFE, $1FFF) OR
INTERRUPT ($1FFA, $1FFB)
VECTOR FETCH
Figure 6-2. Stop Recovery Timing Diagram
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A — Rev. 5.0
MOTOROLA
Low-Power Modes
Technical Data
53