SH7263 Datasheet, PDF (321/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 9 Bus State Controller (BSC)
9.4.6 Refresh Timer Counter (RTCNT)
RTCNT is an 8-bit counter that increments using the clock selected by bits CKS[2:0] in RTCSR.
When RTCNT matches RTCOR, RTCNT is cleared to 0. The value in RTCNT returns to 0 after
counting up to 255. When the RTCNT is written, the upper 16 bits of the write data must be
H'A55A to cancel write protection.
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Bit: 15 14 13 12 11 10 9
-
-
-
-
-
-
-
Initial value: 0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
8
7
6
5
4
3
2
1
0
-
0
0
0
0
0
0
0
0
0
R R/W R/W R/W R/W R/W R/W R/W R/W
Bit
31 to 8
Initial
Bit Name Value
⎯
All 0
7 to 0
All 0
R/W Description
R
Reserved
These bits are always read as 0.
R/W 8-Bit Counter
Rev. 2.00 Mar. 14, 2008 Page 287 of 1824
REJ09B0290-0200