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H8SX1663 bảng dữ liệu(PDF) 219 Page - Renesas Technology Corp

tên linh kiện H8SX1663
Giải thích chi tiết về linh kiện  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 167 of 1102
REJ09B0294-0100
6.2.17
Refresh Timer Counter (RTCNT)
RTCNT counts up on the internal clock selected by bits RTCS2 to RTCK0 in REFCR.
When the RTCNT value matches the RTCOR value (compare match), the CMF flag in REFCR is
set to 1 and RTCNT is initialized to H'00. At this time, when the RFSHE bit in REFCR is set to 1,
a refresh cycle is generated. When the RFSHE bit is cleared to 0 and the CMIE bit in REFCR is
set to 1, a compare match interrupt (CMI) is generated.
Bit
Bit Name
Initial Value
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
6.2.18
Refresh Time Constant Register (RTCOR)
RTCOR specifies intervals at which a compare match for RTCOR and RTCNT is generated.
The RTCOR value is always compared with the RTCNT value. When they match, the CMF flag
in REFCR is set to 1 and RTCNT is initialized to H'00.
Bit
Bit Name
Initial Value
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



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