Low Power Modes - Texas Instruments C28 Series Student Manual

Low Power Modes

Low Power Mode Control Register 0
Low Power Mode Control Register 0
Low Power Mode Entering Low Power Mode Entering
1. Set LPM bits
1. Set LPM bits
2. Enable desired exit interrupt(s)
2. Enable desired exit interrupt(s)
3. Execute IDLE instruction 3. Execute IDLE instruction
4. The Power down sequence of the hardware
4. The Power down sequence of the hardware
C28x - System Initialization
Low Power Modes
Low Power Modes
Low Power CPU Logic
Low Power CPU Logic
Mode Clock
Mode Clock
Normal Run on
Normal Run on
IDLE IDLE off off
STANDBY off
STANDBY off
HALT off
HALT off
LPMCR0 @ 0x00701E LPMCR0 @ 0x00701E
Qualify before waking
Qualify before waking
from STANDBY mode from STANDBY mode
15 15 - - 8 8
reserved
depends on LP mode depends on LP mode
Watchdog
Peripheral Watchdog
Peripheral
Clock
Logic Clock Clock
Logic Clock
on on
on on
on on on on
off on
off on
off off
off off
(lab file: SysCtrl .c)
(lab file: SysCtrl .c)
000000 = 2 000000 = 2
000001 = 3 000001 = 3
.
.
.
.
.
.
111111 = 65 OSCCLKS
111111 = 65 OSCCLKS
7 7 - - 2 2 1 1
QUALSTDBY QUALSTDBY LPM1 LPM1
Low Power Mode Selection
Low Power Mode Selection
00 = Idle
00 = Idle
01 = Standby
01 = Standby
1x = Halt 1x = Halt
Low Power Modes
PLL /
PLL /
OSC
OSC
on
on
on on
on
on
off
off
OSCCLKs OSCCLKs
OSCCLKs OSCCLKs
. .
. .
. .
. .
. .
. .
0 0
LPM0 LPM0
5 - 9