HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 388

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 9
Rev. 3.00 Jan. 18, 2008 Page 326 of 1458
REJ09B0033-0300
Bit
12
11
10
9
Bit Name

RFSH
RMODE
PDOWN
Bus State Controller (BSC)
Initial
Value
0
0
0
0
R/W
R
R/W
R/W
R
Description
Refresh Control
Refresh Control
Power-Down Mode
Reserved
This bit is always read as 0. The write value should always
be 0.
Specifies whether or not the refresh operation of the SDRAM
is performed.
0: No refresh
1: Refresh
Specifies whether to perform auto-refresh or self-refresh
when the RFSH bit is 1. When the RFSH bit is 1 and this bit
is 1, self-refresh starts immediately. When the RFSH bit is 1
and this bit is 0, auto-refresh starts according to the contents
that are set in RTCSR, RTCNT, and RTCOR.
0: Auto-refresh is performed
1: Self-refresh is performed
Specifies whether the SDRAM is entered in power-down
mode or not after the access to SDRAM is completed. If this
bit is set to 1, the CKE pin is pulled to low to place the
SDRAM to power-down mode.
0: Does not place the SDRAM in power-down mode after
1: Places the SDRAM in power-down mode after access
access completion.
completion.