Halt Function - Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual

AGB Programming Manual

16.2 Halt Function

Halt Function Summary
During periods when CPU processing is not considered essential you can reduce
power consumption if used efficiently.
Halt Transition Method
1. Transition to Halt Mode
AGB is placed in halt mode by executing the system call [SWI <2>
instruction (Halt( )).
AGB enters Halt status.
2. Cancel Halt Mode
Halt is canceled when the interrupt enable register IE's corresponding
flag is set with any type of interrupt request.
System Working Status in Halt Mode
The working status of each block of the AGB system during a semi-stop is
shown in the following table.
Block
AGB-CPU
LCD Controller
Sound
Timer
Serial Communication
Key
System Clock
©1999 - 2001 Nintendo of America Inc.
Working
X Wait status resulting from wait signal
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
164
Power Down Functions
Status
D.C.N. AGB-06-0001-002B4