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CHAPTER 20 STANDBY FUNCTION
488
STOP Mode Setting
With subsystem clock
Without subsystem clock
Item
Clock generator
Only main system clock stops oscillation.
CPU
Operation stop.
Output port (output latch)
Status before STOP instruction execution is held.
16-bit timer/event counter
Operation stop.
8-bit timer/event counter
Operation enabled when TI1 and TI2 are selected for the count clock.
Watchdog timer
Operation stop.
A/D converter
Watch timer
Operation enabled when f
XT
is selected
Operation stop.
for the count clock.
Serial
Other than auto- Operation enabled only when external input clock is selected as serial clock.
Interface
matic transmit/
receive function
Automatic
Operation stop.
transmit/receive
function
External
INTP0
Operation disabled.
interrupt
INTP1 to INTP3 Operation enabled.
Bus line in AD0 to AD7
High-impedance
External
A8 to A15
Status before STOP instruction execution is held.
Expansion ASTB
Low level
WR, RD
High level
WAIT
High-impedance
20.2.2 STOP mode
(1) STOP mode set and operating status
The STOP mode is set by executing the STOP instruction. It can be set only with the main system clock.
Cautions
1. When the STOP mode is set, X1 input is internally short-circuited to V
SS
(ground potential)
to suppress the leakage at the crystal oscillator. Thus, do not use the STOP mode in a
system where an external clock is used for the main system clock.
2. Because the interrupt request signal is used to clear the standby mode, if there is an
interrupt source with the interrupt request flag set and the interrupt mask flag reset, the
standby mode is immediately cleared if set. Thus, the STOP mode is reset to the HALT mode
immediately after execution of the STOP instruction. After the wait set using the oscillation
stabilization time select register (OSTS), the operating mode is set.
The operating status in the STOP mode is described below.
Table 20-3. STOP Mode Operating Status
Содержание 78014Y Series
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