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Chapter 23 Sub Oscillation Stabilisation Timer
4.Register
4. Register
4.1 WPCRH: Sub oscillation stabilisation timer Control Register
This register is used to select interval time, clear the timer, control interrupt, control timer stop etc., and
confirm the states.
• WPCRH: Address 04CAh (Access: Byte)
(For the attributes, refer to “Meaning of Bit Attribute Symbols (Page No.10)”.)
(Refer to “8. Caution (Page No.309)”.)
• Bit7: Sub oscillation stabilisation timer interrupt request flag
• The sub oscillation stabilisation timer interrupt request flag bit is set to “1” at the falling edge of the
selected interval period output.
• Bit6: Interrupt request enable
• If the interrupt request enable bit is set to “1” an interrupt request is enabled.
• If the sub oscillation stabilisation timer interrupt request flag is (WIF=“1”), and if the interrupt request
enable bit (WIE) is set to “1”, an interrupt request is immediately generated.
• Bit5: Timer operation enable
• Bit4-3: Reserved bit Be sure to write “0”. The read value is “0”.
• Bit2-1: Interval period selection
• Bit0: Timer clear
• The timer is also cleared by INITX terminal input and watchdog reset.
Notes 1: Initial value can be set using the setting initialization reset (INIT terminal input,
7 6 5 4 3 2 1 0 bit
WIF WIE WEN – – WS1 WS0 WCL
0 0 0 X X 0 0 1 Initial value (At INIT) *1
R(RM1),W R/W R/W RX/W0 RX/W0 R/W R/W R1,W Attribute
WIF Read Operation Write Operation
0 Without interrupt request Clears the interrupt request flag
1 With interrupt request Writing does not affect operation
WIE Operation
0 Interrupt request is prohibited
1 Interrupt request enable
WEN Operation
0 Stops timer operation
1 Enables timer operation
WS1 WS0
Interval period (F
CL-SUB
= 32.768kHz)
00
2
10
/F
CL-SUB
(31.25ms)
01
2
13
/F
CL-SUB
(0.25s)
10
2
14
/F
CL-SUB
(0.50s)
11
2
15
/F
CL-SUB
(1.00s)
WCL Operation
0 Clears the sub oscillation stabilisation timer.
1 Writing does not affect write operation.