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HD64F2149YV bảng dữ liệu(PDF) 341 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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HD64F2149YV bảng dữ liệu(HTML) 341 Page - Renesas Technology Corp

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Section 11 16-Bit Free-Running Timer
Rev. 3.00 Jan 18, 2006 page 313 of 1044
REJ09B0280-0300
11.2
Register Descriptions
11.2.1
Free-Running Counter (FRC)
Bit
Initial
15
0
R/W
14
0
R/W
13
0
R/W
12
0
R/W
11
0
R/W
10
0
R/W
9
0
R/W
8
0
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
value
Write
Read/
FRC is a 16-bit readable/writable up-counter that increments on an internal pulse generated from a
clock source. The clock source is selected by bits CKS1 and CKS0 in TCR.
FRC can also be cleared by compare-match A.
When FRC overflows from H'FFFF to H'0000, the overflow flag (OVF) in TCSR is set to 1.
FRC is initialized to H'0000 by a reset and in hardware standby mode.
11.2.2
Output Compare Registers A and B (OCRA, OCRB)
Bit
Initial
15
1
R/W
14
1
R/W
13
1
R/W
12
1
R/W
11
1
R/W
10
1
R/W
9
1
R/W
8
1
R/W
7
1
R/W
6
1
R/W
5
1
R/W
4
1
R/W
3
1
R/W
2
1
R/W
1
1
R/W
0
1
R/W
value
Write
Read/
OCRA and OCRB are 16-bit readable/writable registers, the contents of which are continually
compared with the value in the FRC. When a match is detected, the corresponding output compare
flags (OCFA or OCFB) is set in TCSR.
In addition, if the output enable bit (OEA or OEB) in TOCR is set to 1, when OCR and FRC
values match, the logic level selected by the output level bit (OLVLA or OLVLB) in TOCR is
output at the output compare pin (FTOA or FTOB). Following a reset, the FTOA and FTOB
output levels are 0 until the first compare-match.
OCR is initialized to H'FFFF by a reset and in hardware standby mode.



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