Stop Mode - NEC 78K0S/KA1+ Preliminary User's Manual

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13.2.2 STOP mode

(1) STOP mode setting and operating statuses
The STOP mode is set by executing the STOP instruction.
Caution Because an interrupt request signal is used to clear the standby mode, if there is an interrupt
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The operating statuses in the STOP mode are shown below.
Item
System clock
CPU
Port (latch)
16-bit timer/event counter 00
8-bit timer 80
8-bit timer Sets count clock to f
H1
Sets count clock to
f
RL
Watchdog "Clock to peripheral hardware" selected as
timer operating clock
"Low-speed Ring-OSC
clock" selected as
operating clock
A/D converter
Serial interface UART6
Low-voltage detector
External interrupt
Notes 1. When "Stopped by software" is selected for low-speed Ring-OSC by the option byte the low-speed Ring-
OSC is stopped by software (for the option byte, see CHAPTER 17 OPTION BYTE).
2. "Low-speed Ring-OSC cannot be stopped" or "low-speed Ring-OSC can be stopped by software" can be
selected by the option byte.
232
CHAPTER 13 STANDBY FUNCTION
source with the interrupt request flag set and the interrupt mask flag reset, the standby
mode is immediately cleared if set. Thus, in the STOP mode, the normal operation mode is
restored after the STOP instruction is executed and then the operation is stopped for the
duration of eight low-speed Ring-OSC clocks (after an additional wait time for stabilizing
oscillation set by the oscillation stabilization time select register (OSTS) has elapsed when
crystal/ceramic oscillation is used).
Table 13-4. Operating Statuses in STOP Mode
Setting of STOP Mode
12
to f /2
XP XP
Low-speed Ring-OSC
7
/2 cannot be stopped
Low-speed Ring-OSC
can be stopped
Low-speed Ring-OSC
cannot be stopped
Low-speed Ring-OSC
can be stopped
Preliminary User's Manual U16898EJ1V0UD
When Low-Speed Ring-OSC
Oscillation Continues
Oscillation stops.
Operation stops.
Holds status before STOP mode is set.
Operation stops.
Operation stops.
Operation stops.
Operable
Note 2
.
Note 2
.
Operation stops.
Operable
Note 2
.
Operation stops.
Note 2
.
Operation stops.
Operation stops.
Operable
Operable
When Low-Speed Ring-OSC
Note 1
Oscillation Stops
−
Operation stops.
−