NEC switch - Manual (Page 180)

CHAPTER 12 STANDBY FUNCTION
User’s Manual U12978EJ3V0UD
180
12.2 Standby Function Operation
12.2.1 HALT mode
(1) HALT mode
The HALT mode is set by executing the HALT instruction.
The operation status in the HALT mode is shown in the following table.
Table 12-1. HALT Mode Operation Status
Item HALT Mode Operation Status
Clock generator Oscillation enabled
CPU Operation disabled
Port (output latch) Remains in the state before the selection of HALT mode.
8-bit timer 00 (TM00) Operation enabled
8-bit timer/event counter 01 (TM01) Operation enabled
Watchdog timer Operation enabled
USB function Operation enabled
Serial interface Operation enabled
Key return Operation enabled Note 1
External interrupt Operation enabled Note 2
Notes 1. Operation is enabled only for pins set in key return mode register 00 (KRM00).
2. Maskable interrupt that is not masked