CHAPTER 8 CLOCK GENERATOR FUNCTIONS
User’s Manual U12688EJ4V0UM00
237
8.5.2 Control registers
(1) Power save control register (PSC)
This is an 8-bit register that controls the power save mode.
This is one of the specific registers and is active only when accessed by a specific sequence during a write
operation. For details, refer to 3.4.9 Specific registers.
This register can be read/written in 8- or 1-bit units.
Address
FFFFF070H
7
DCLK1
PSC
6
DCLK0
5
TBCS
4
CESEL
3
0
2
IDLE
1
STP
0
0
After reset
00H
Bit Position
Bit Name
Function
Disable CLKOUT
This specifies the CLKOUT pin’s operating mode.
DCLK1
DCLK0
Mode
0
0
Normal output mode
0
1
RFU (reserved)
1
0
RFU (reserved)
1
1
Clock output inhibit mode
7, 6
DCLK1,
DCLK0
5
TBCS
Time Base Count Select
Selects the time base counter clock.
0: f
XX
/2
8
1: f
XX
/2
9
Details are shown in 8.6.2 Time base counter (TBC).
4
CESEL
Crystal/External Select
Specifies the function of pins X1 and X2.
0: An oscillator is connected to pins X1 and X2.
1: An external clock is connected to pin X1.
If CESEL = 1, the oscillator’s feedback loop is cut and current leakage is prevented
when in the software STOP mode. Also, the oscillation stabilization time count by the
time base counter (TBC) after the software STOP mode is released is not carried out.
2
IDLE
Note
IDLE Mode
Specifies the IDLE mode.
It enters the IDLE state if 1 is written.
It is automatically reset (0) if the IDLE mode is released.
1
STP
Note
STOP Mode
Specifies the software STOP mode.
It enters the STOP state if 1 is written.
It is automatically reset (0) if the software STOP mode is released.
Note If the IDLE bit is set at 1 and the STP bit is also set at 1, the system enters the software STOP mode.
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