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H838532H bảng dữ liệu(PDF) 239 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838532H bảng dữ liệu(HTML) 239 Page - Renesas Technology Corp

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Section 9 Timers
Rev. 1.00 May 30, 2008 Page 219 of 484
REJ09B0436-0100
(2) Timer Counter C (TCC)
Bit
Initial value
Read/Write
7
TCC7
0
R
6
TCC6
0
R
5
TCC5
0
R
4
TCC4
0
R
3
TCC3
0
R
0
TCC0
0
R
2
TCC2
0
R
1
TCC1
0
R
TCC is an 8-bit read-only up-counter, which is incremented by internal clock or external event
input. The clock source for input to this counter is selected by bits TMC2 to TMC0 in timer mode
register C (TMC). TCC values can be read by the CPU at any time.
When TCC overflows from H'FF to H'00 or to the value set in TLC, or underflows from H'00 to
H'FF or to the value set in TLC, the IRRTC bit in IRR2 is set to 1.
TCC is allocated to the same address as TLC.
Upon reset, TCC is initialized to H'00.
(3) Timer Load Register C (TLC)
Bit
Initial value
Read/Write
7
TLC7
0
W
6
TLC6
0
W
5
TLC5
0
W
4
TLC4
0
W
3
TLC3
0
W
0
TLC0
0
W
2
TLC2
0
W
1
TLC1
0
W
TLC is an 8-bit write-only register for setting the reload value of timer counter C (TCC).
When a reload value is set in TLC, the same value is loaded into timer counter C as well, and TCC
starts counting up from that value. When TCC overflows or underflows during operation in auto-
reload mode, the TLC value is loaded into TCC. Accordingly, overflow/underflow periods can be
set within the range of 1 to 256 input clocks.
The same address is allocated to TLC as to TCC.
Upon reset, TLC is initialized to H'00.



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