HD643303x Hitachi, HD643303x Datasheet - Page 313
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
(572 pages)
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10.2 Register Descriptions
10.2.1 Timer Counter (TCNT)
TCNT is an 8-bit readable and writable* up-counter.
When the TME bit is set to 1 in TCSR, TCNT starts counting pulses generated from an internal
clock source selected by bits CKS2 to CKS0 in TCSR. When the count overflows (changes from
H'FF to H'00), the OVF bit is set to 1 in TCSR. TCNT is initialized to H'00 by a reset and when
the TME bit is cleared to 0.
Note: * TCNT is write-protected by a password. For details see section 10.2.4, Notes on Register
Bit
Initial value
Read/Write
Access.
R/W
7
0
R/W
6
0
R/W
5
0
298
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
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