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Chapter 9 Reset
4.Registers
4.2 STCR: Standby Control Register
This register is used for software reset control (changing to standby mode, pin control in stop mode, and clock
oscillation halted in stop mode), and specifies the oscillation stabilization wait time.
Note: See also “Chapter 10 Standby (Page No.155)”.
• STCR: Address 0481h (Access: Byte, Half-word)
Note: See “Meaning of Bit Attribute Symbols (Page No.10)” for details of the attributes.
• Bit7: Stop mode
Writing “1” to the stop mode bit (STOP) changes to stop mode.
See “Chapter 10 Standby (Page No.155)” for details.
• Bit6: Sleep mode
Writing “1” to the sleep mode bit (SLEEP) changes to sleep mode.
See
“Chapter 10 Standby (Page No.155)” for details.
• Bit5: High impedance mode
Writing “1” to the high impedance mode bit (HIZ) sets pin to high impedance (Hi-z) during stop mode.
See
“Chapter 10 Standby (Page No.155)” for details.
• Bit4: Software reset
Writing “0” to the software reset bit triggers a software reset.
• Note that negative logic is used.
• The read value is always “1”.
• Bit3-2: Oscillation stabilization time selection
The oscillation stabilization time selection bits (OS[1:0]) set the oscillation stabilization time as follows:
(F2 x 2
1
, F2 x 2
11
, F2 x 2
16
, F2 x 2
22
)
The count is supplied by the timebase counter.
Initialized to “00” (F2 x 2
1
, main clock) by a reset triggered by INIT pin input.
See “Chapter 19 Timebase Timer (Page No.263)” for details.
• Bit1: Halt sub clock oscillation
Writing “1” to the halt sub clock oscillation bit (OSCD2) halts the oscillation of the sub clock during stop mode.
• Bit0: Halt main clock oscillation
Writing “1” to the halt main clock oscillation bit (OSCD1) halts the oscillation of the main clock during stop mode.
76543210 bit
STOP SLEEP HIZ SRST OS1 OS0 OSCD2 OSCD1
00110011
Initial value
(INIT pin input)
0011XX11
Initial value
(Watchdog reset)
00X1XXXX
Initial value
(Software reset)
R/W R/W R/W R1,W R/W R/W RX/WX R/W Attribute
SRST Operation
0 Trigger a software reset
1 Do not trigger a software reset