HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 225

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.5.11
The chip is provided with a DRAM refresh control function. Either of two refreshing methods can
be selected: CAS-before-RAS (CBR) refreshing, or self-refreshing.
CAS-before-RAS (CBR) Refreshing: To select CBR refreshing, set the RFSHE bit in DRAMCR
to 1, and clear the RMODE bit to 0.
With CBR refreshing, RTCNT counts up using the input clock selected by bits CKS2 to CKS0 in
DRAMCR, and when the count matches the value set in RTCOR (compare match), refresh control
is performed. At the same time, RTCNT is reset and starts counting again from H'00. Refreshing is
thus repeated at fixed intervals determined by RTCOR and bits CKS2 to CKS0. Set a value in
RTCOR and bits CKS2 to CKS0 that will meet the refreshing interval specification for the DRAM
used.
When bits CKS2 to CKS0 are set, RTCNT starts counting up. RTCNT and RTCOR settings
should therefore be completed before setting bits CKS2 to CKS0.
Do not clear the CMF flag when refresh control is being performed (RFSHE = 1).
RTCNT operation is shown in figure 6.23, compare match timing in figure 6.24, and CBR refresh
timing in figure 6.25.
Access to other normal space can be performed during the CBR refresh interval.
Refresh request
RTCOR
H'00
Refresh Control
RTCNT
Figure 6.23 RTCNT Operation
Rev.6.00 Sep. 27, 2007 Page 195 of 1268
Section 6 Bus Controller
REJ09B0220-0600