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Chapter 10 Standby
4.Registers
• Bit0: Main clock oscillation halt
4.2 TBCR: Timebase timer control register
This register controls the timebase timer interrupts and the options for resets and standby
operation.
Note: See also “Chapter 19 Timebase Timer (Page No.263)”.
• TBCR: Address 0482h (Access: Byte)
(See “Meaning of Bit Attribute Symbols (Page No.10)” for details of the attributes.)
• Bit7: Interrupt request flag for timebase timer
• This flag goes to “1” when a timebase timer interrupt request occurs
• Bit6: Interrupt request enable for the timebase timer
• Writing “1” to this bit enables timebase timer interrupt requests.
• Bit5-3: Interval time selection for timebase timer
• Writing a value in the range “000”-“111” to these bits selects the interval time for the timebase timer.
(F x 2
11
, x 2
12
, x 2
13
, x 2
22
, x 2
23
, x 2
24
, x 2
25
, x 2
26
)
• Bit2: Reserved Writing does not affect the operation. The read value is undefined.
• Bit1: Enable synchronous reset operation
• Selects a normal reset “0” or a synchronous reset “1”.
• Bit0: Enable synchronous standby operation
OSCD1 Operation of main clock during stop mode
0 Continue oscillation
1 Halt oscillation
7 6 5 4 3 2 1 0 bit
TBIF TBIE TBC2 TBC1 TBC0 --- SYNCR SYNCS
00XXXX00
Initial value (INIT pin,
watchdog)
0 0XXXXXX
Initial value (Software
reset)
R(RM1),W R/W R/W R1,W R/W RX/WX RX/WX R/W Attribute
SYNCS Operation
0 Normal reset operation (Not permitted on this model).
1 Enable synchronous standby operation (always set this before changing to a standby mode).