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CHAPTER 20 STANDBY FUNCTION
485
20.2 Standby Function Operations
20.2.1 HALT mode
(1) HALT mode set and operating status
The HALT mode is set by executing the HALT instruction. It can be set with the main system clock or the
subsystem clock.
The operating status in the HALT mode is described below.
Table 20-1. HALT Mode Operating Status
HALT Mode
When HALT instruction is executed during
When HALT instruction is executed during
Setting
main system clock oscillation
subsystem clock oscillation
Item
Without subsystem
With subsystem
When main system
When main system
clock
Note 1
clock
Note 2
clock oscillation continues
clock oscillaton stops
Clock generator
Both main system clock and subsystem clock can be oscillated.
Clock supply to the CPU stops.
CPU
Operation stop.
Port (output latch)
Status before HALT instruction execution is held.
16-bit timer/event counter
Operation enabled.
Operation stop.
8-bit timer/event counter
Operation enabled.
Operation enabled
when TI1 and TI2 are
selected for the count
clock.
Watchdog timer
Operation enabled.
Operation stop.
A/D converter
Operation enabled.
Operation stop.
Watch timer
Operation enabled
Operation enabled.
Operation enabled
when f
X
/2
8
is selected
when f
XT
is selected
for the count clock.
for the count clock.
Serial
Other than auto- Operation enabled.
Operation enabled
Interface
matic transmit/
when external SCK is
receive function
selected.
Automatic
Operation stop.
transmit/receive
function
External
INTP0
Operation enabled when the clock (f
X
/2
6
and f
X
/2
7
) for the peripheral
Operation stop.
interrupt
hardware are selected as sampling clock.
INTP1 to INTP3 Operation enabled.
Bus line in AD0 to AD7
High-impedance
External
A8 to A15
Status before HALT instruction execution is held.
Expansion ASTB
Low level
WR, RD
High level
WAIT
High-impedance
Notes
1.
Includes case when an external clock is not supplied in the subsystem clock.
2.
Includes case when an external clock is supplied in the subsystem clock.
Summary of Contents for 78014Y Series
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