H8SX1663 datasheet(219/1158 Pages) RENESAS

Part #	H8SX1663

Description	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

PDF	1158 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	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

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

H8SX1663 Datasheet(PDF) 219 Page - Renesas Technology Corp