NEC 78K0 User Manual page 337

HALT Mode Setting
Item
System clock
CPU
Port (latch)
16-bit timer/event counter 00
8-bit timer/event counter 50
8-bit timer/event counter 51
8-bit timer H0
8-bit timer H1
Watch timer
Watchdog Ring-OSC cannot
Note 2
timer be stopped
Ring-OSC can be
Note 2
stopped
A/D converter
Serial UART0
interface
UART6
CSI10
Clock monitor
Note 3
Power-on-clear function
Low-voltage detection function
External interrupt
Notes 1. When "Stopped by software" is selected for Ring-OSC by a mask option and Ring-OSC is stopped by
software (for mask options, see CHAPTER 22 MASK OPTIONS).
2. "Ring-OSC cannot be stopped" or "Ring-OSC can be stopped by software" can be selected by a mask
option.
3. When "POC used" is selected by a mask option.
CHAPTER 17 STANDBY FUNCTION
Table 17-2. Operating Statuses in HALT Mode (2/2)
When HALT Instruction Is Executed While CPU Is Operating on Subsystem Clock
When X1 Input Clock Oscillation Continues
When Ring-OSC When Ring-OSC
Oscillation Continues Oscillation Stopped
Clock supply to the CPU is stopped.
Operation stopped
Status before HALT mode was set is retained
Operable
Operable
Operable
Operable
Operable Operable only when the
X1 input clock is selected
as the count clock
Operable
Operable
Operation stopped
Operable
Operable
Operable
Operable
Operable Operation stopped
Operable
Operable
Operable
User's Manual U16227EJ2V0UD
When X1 Input Clock Oscillation Stopped
When Ring-OSC
Note 1
Oscillation Continues
Operation stopped
Operable only when TI50 is selected as the count clock
Operable only when TI51 is selected as the count clock
Operable only when TM50 output is selected as the
count clock during 8-bit timer/event counter 50
operation
Operable only when f
is selected as the count
clock
Operation guaranteed only when subsystem clock is
selected
−
Operable
Not operable
Operable only when TM50 output is selected as the
serial clock during TM50 operation
Operable only when external clock is selected as the
serial clock
When Ring-OSC
Note 1
Oscillation Stopped
7
/2 Operation stopped
R
−
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