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SH7672 Datasheet(PDF) 236 Page - Renesas Technology Corp |
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SH7672 Datasheet(HTML) 236 Page - Renesas Technology Corp |
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236 / 1292 page  Section 7 Bus State Controller (BSC) Rev. 1.00 Nov. 14, 2007 Page 210 of 1262 REJ09B0437-0100 7.4.6 Refresh Timer Counter (RTCNT) RTCNT is an 8-bit counter that increments using the clock selected by bits CKS[2:0] in RTCSR. When RTCNT matches RTCOR, RTCNT is cleared to 0. The value in RTCNT returns to 0 after counting up to 255. When the RTCNT is written, the upper 16 bits of the write data must be H'A55A to cancel write protection. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0000000000000000 RRRRRRRRRRRRRRRR 0000000000000000 R R R R R R R R R/W R/W R/W R/W R/W R/W R/W R/W Bit: Initial value: R/W: Bit: Initial value: R/W: ---------------- -------- Bit Bit Name Initial Value R/W Description 31 to 8 All 0 R Reserved These bits are always read as 0. 7 to 0 All 0 R/W 8-Bit Counter |
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