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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SH7014 데이터시트(PDF) 155 Page - Renesas Technology Corp |
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SH7014 데이터시트(HTML) 155 Page - Renesas Technology Corp |
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155 / 754 page  8. Bus State Controller (BSC) Rev.5.00 Sep. 27, 2007 Page 121 of 716 REJ09B0398-0500 8.2.7 Refresh Timer Counter (RTCNT) RTCNT is a 16-bit read/write register that is used as an 8-bit up counter for refreshes or generating interrupt requests. RTCNT counts up with the clock selected by the CKS2 to CKS0 bits of the RTCSR. RTCNT values can always be read/written by the CPU. When RTCNT matches RTCOR, RTCNT is cleared to H'0000 and the CMF flag of the RTCSR is set to 1. If the RFSH bit of RTCSR is 1 and the RMD bit is 0 at this time, a CAS-before-RAS refresh is performed. Additionally, if the CMIE bit of RTCSR is a 1, a compare match interrupt (CMI) is generated. Bits 15 to 8 are reserved and play no part in counter operation. They are always read as 0. RTCNT is initialized by power-on resets to H'0000, but is not initialized by software standbys. Bit: 15 14 13 12 11 10 9 8 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ Initial value: 0 0 0 0 0 0 0 0 R/W: R R R R R R R R Bit: 7 6 5 4 3 2 1 0 Initial value: 0 0 0 0 0 0 0 0 R/W: R/W R/W R/W R/W R/W R/W R/W R/W |
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