Rev. 2.00, 09/03, page 177 of 690
Bit
Bit
Name
Initial
Value
R/W
Description
2
0
R
Reserved
This bit is always read as 0. The write value should always be
0.
1
0
A3COL1
A3COL0
0
0
R/W
R/W
Number of Bits of Column Address for Area 3
Specifies the number of bits of the column address for area 3.
00: 8 bits
01: 9 bits
10: 10 bits
11: Setting prohibited
7.4.5
Refresh Timer Control/Status Register (RTCSR)
RTCSR specifies various items about refresh for SDRAM.
This register only accepts 32-bit writing to prevent incorrect writing. In this case, the upper 16 bits
of the data must be H'A55A, otherwise writing cannot be performed. When reading, the upper 16
bits are read as H'0000.
RTCSR
Bit
Bit
Name
Initial
Value
R/W
Description
31 to 8
0
R
Reserved
7
CMF
0
R/W
Compare Match Flag
0: Clearing condition When 0 is written in CMF after reading
out RTCSR during CMF = 1.
1: Setting condition When the condition RTCNT = RTCOR is
satisfied.
6
CMIE
0
R/W
CMF Interrupt Enable
0: CMF interrupt request is disabled.
1: CMF interrupt request is enabled.
Summary of Contents for SH7705
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