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Chapter 49 Real-Time Clock
4.Registers
4.3 WTHR/WTMR/WTSR: Hour/Minute/Second Registers
These registers hold time information (HH/MM/SS) for Real-time Clock.
• WTHR (Hour register): Address 04A8
H
(Access: Byte, Half-word)
• WTMR (Minute register): Address 04A9
H
(Access: Byte, Half-word)
• WTSR (Second register): Address 04AA
H
(Access: Byte, Half-word)
• The values written to the hour/minute/second registers are the initial values to be loaded to the hour/
minute/second counters.
By setting “1” to the update bit (WTCR.UPDT) or the start bit (WTCR.ST), the hour/minute/second
register values are written to the hour/minute/second counters.
• The hour/minute/second counter values are saved to the hour/minute/second registers every time when
the second counter overflows, that is, at intervals of one minute. When the hour/minute/second counters
are read, the saved count values, not written ones, are read.
• The hour/minute/second registers consist of two separate sets of registers: one for reading and the other
for writing.
(See “8. Caution (Page No.961)”.)
WTHR
76543210bit
– – – H4 H3 H2 H1 H0
– – –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
WTMR
76543210bit
– – M5 M4 M3 M2 M1 M0
– –XXXXXXInitial value
– – Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged When reset
RX/WX RX/WX R,W R,W R,W R,W R,W R,W Attribute
WTSR
76543210bit
– – S5 S4 S3 S2 S1 S0
– –XXXXXXInitial value
– – Unchanged Unchanged Unchanged Unchanged Unchanged Unchanged When reset
RX/WX RX/WX R,W R,W R,W R,W R,W R,W Attribute