H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 209

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

(2) Self-Refreshing
A self-refresh mode (battery backup mode) is provided for DRAM as a kind of standby mode. In
this mode, refresh timing and refresh addresses are generated within the DRAM.
To select self-refreshing, set the RFSHE bit and RMODE bit in DRAMCR to 1. Then, when a
SLEEP instruction is executed to enter software standby mode, the CAS and RAS signals are
output and DRAM enters self-refresh mode, as shown in figure 6.27.
When software standby mode is exited, the RMODE bit is cleared to 0 and self-refresh mode is
cleared.
When switching to software standby mode, if there is a CBR refresh request, CBR refreshing is
executed before self-refresh mode is entered.
CAS, LCAS
Note: n = 2 to 5
Figure 6.27 Self-Refresh Timing (When CW2 = 1, or CW2 = 0 and LCASS = 0)
CSn (RAS)
HWR (WE)
T
Rp
T
Rcr
High
Rev. 3.00 Sep 15, 2006 page 175 of 988
Software
standby
Section 6 Bus Controller
REJ09B0330-0300
T
Rc3