HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 291

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Bit 2: RRC2
0
1
7.2.9
The 8-bit counter RTCNT counts up with input clocks. The clock select bit of RTCSR selects an
input clock. RTCNT values can always be read/written by the CPU. When RTCNT matches
RTCOR, RTCNT is cleared. Returns to 0 after it counts up to 255.
Bits 15 to 8—Reserved: These bits are always read as 0. The write value should always be 0.
7.2.10
274
Initial value:
Initial value:
Initial value:
Refresh Timer Counter (RTCNT)
Refresh Time Constant Register (RTCOR)
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Bit 1: RRC1
0
1
0
1
R/W
15
—
15
—
0
R
7
0
0
R
R/W
14
—
14
—
0
R
6
0
0
R
Bit 0: RRC0
0
1
0
1
0
1
0
1
R/W
13
—
13
—
0
R
5
0
0
R
R/W
12
—
12
—
0
R
4
0
0
R
Description
1 refresh
2 refreshes
4 refreshes
6 refreshes
8 refreshes
Reserved (do not set)
Reserved (do not set)
Reserved (do not set)
R/W
11
—
11
—
0
R
3
0
0
R
R/W
10
—
10
—
0
R
2
0
0
R
R/W
—
—
9
0
R
1
0
9
0
R
(Initial value)
R/W
—
—
8
0
R
0
0
8
0
R