TTP259
TonTouchTM
Preliminary
S-4: Power saving mode (Stop mode and Sleep mode)
The CPU enters stop or sleep mode is operated by writing CPU power
saving control register (PS). During the power saving mode, CPU holds the
internal status of the system. In stop mode, the oscillator clocks will be
stopped and system need a warm-up time for the stability of system clock
running after wake up.
S-5: MCU System Operating Mode
The MCU has 4 operating modes, including high speed operation, low
speed operation, sleep and stop modes. After power on reset, the MCU will
go into high speed operation mode automatically. After wake up from
sleep mode, the MCU will resume the last operation mode.
STOP mode
OSCH off & OSCL off
STOP/
STOP/
wake up
wake up
Reset
High speed operating
mode
OSCH on & OSCL on
Reset release
H/L
Reset
Low speed operating
Reset
mode
RESET
OSCH off & OSCL on
SLEEP/
wake up
Reset
SLEEP/
wake up
SLEEP mode
CPU stop
Figure: System Operation State Diagram
2015/05/25
Page 17 of 81
Ver: 1.1
TTELEC [ TT Electronics ]
