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Chapter 49 Real-Time Clock
4.Registers
4.2 WTBR: Sub-Second Registers
These registers are used to hold values to be reloaded to the 21 bit down counter.
• WTBR0: Address 04A5
H
(Access: Byte, Half-word, Word)
• WTBR1: Address 04A6
H
(Access: Byte, Half-word, Word)
• WTBR2: Address 04A7
H
(Access: Byte, Half-word, Word)
(For attributes, refer to “Meaning of Bit Attribute Symbols (Page No.10)”.)
The sub-second registers, WTBR, holds values to be reloaded to the 21 bit down counter. When the 21 bit
down counter value becomes “0”, the settings of WTBR are reloaded to the 21 bit down counter.
(See “8. Caution (Page No.961)”.)
Remark: The reload value to be set in the sub-second registers corresponds to the time for half a second. One
second is reached after counting twice the reload value set in WTBR.
(See “7.1 How do I set the count period of 1 second? (Page No.959)”.)
WTBR0
76543210bit
– – – D20 D19 D18 D17 D16
– – –XXXXXInitial value
– – – Unchanged Unchanged Unchanged Unchanged Unchanged When reset
RX/WX RX/WX RX/WX R/W R/W R/W R/W R/W Attribute
WTBR1
76543210bit
D15 D14 D13 D12 D11 D10 D9 D8
XXXXXXXXInitial value
Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged When reset
R/W R/W R/W R/W R/W R/W R/W R/W Attribute
WTBR2
76543210bit
D7 D6 D5 D4 D3 D2 D1 D0
XXXXXXXXInitial value
Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged When reset
R/W R/W R/W R/W R/W R/W R/W R/W Attribute