HD6432351 datasheet(175/1025 Pages) RENESAS

номер детали	HD6432351

подробное описание детали	16-Bit Single-Chip Microcomputer

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Section 6 Bus Controller

Rev. 3.00 Sep 15, 2006 page 141 of 988

REJ09B0330-0300

6.2.8

Refresh Timer/Counter (RTCNT)

R/W

Bit

Initial value

R/W

RTCNT is an 8-bit readable/writable up-counter.

RTCNT counts up using the internal clock selected by bits CKS2 to CKS0 in DRAMCR.

When RTCNT matches RTCOR (compare match), the CMF flag in DRAMCR is set to 1 and

RTCNT is cleared to H'00. If the RFSHE bit in DRAMCR is set to 1 at this time, a refresh cycle is

started. Also, if the CMIE bit in DRAMCR is set to 1, a compare match interrupt (CMI) is

generated.

RTCNT is initialized to H'00 by a power-on reset and in hardware standby mode. It is not

initialized by a manual reset or in software standby mode.

6.2.9

Refresh Time Constant Register (RTCOR)

R/W

Bit

Initial value

R/W

RTCOR is an 8-bit readable/writable register that sets the period for compare match operations

with RTCNT.

The values of RTCOR and RTCNT are constantly compared, and if they match, the CMF flag in

DRAMCR is set to 1 and RTCNT is cleared to H'00.

RTCOR is initialized to H'FF by a power-on reset and in hardware standby mode. It is not

initialized by a manual reset or in software standby mode.

HD6432351 датащи(PDF) 175 Page - Renesas Technology Corp