HD64F2149 Datasheet, PDF (429/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Note: * TCNT is write-protected by a password to prevent accidental overwriting. For details see
section 14.2.4, Notes on Register Access.
14.2.2 Timer Control/Status Register (TCSR)
• TCSR0
Bit
Initial value
Read/Write
7
OVF
0
R/(W)*
6
WT/IT
0
R/W
5
TME
0
R/W
4
3
2
RSTS RST/NMI CKS2
0
0
0
R/W R/W R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Note: * Only 0 can be written, to clear the flag.
• TCSR1
Bit
Initial value
Read/Write
7
OVF
0
R/(W)*
6
WT/IT
0
R/W
5
TME
0
R/W
4
PSS
0
R/W
3
2
RST/NMI CKS2
0
0
R/W R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Note: * Only 0 can be written, to clear the flag.
TCSR is an 8-bit readable/writable* register. Its functions include selecting the clock source to be
input to TCNT, and the timer mode.
TCSR is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Note: * TCSR is write-protected by a password to prevent accidental overwriting. For details see
section 14.2.4, Notes on Register Access.
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