HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 403

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

9.2.10
CDCR is a 16-bit counter that indicates the number of collisions that occurred on the line during
data transmission. When the value in this register reaches H'FFFF (65,535), the count is halted.
The counter value is cleared to 0 by a write to this register (the write value is immaterial).
Bits 31 to 16—Reserved: These bits are always read as 0. The write value should always be 0.
Bits 15 to 0—Collision Detect Count 15 to 0 (COLDC15 to COLDC0): These bits indicate the
count of collisions during frame transmission.
Initial value:
Initial value:
Initial value:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Collision Detect Counter Register (CDCR)
COLDC15 COLDC14COLDC13 COLDC12COLDC11 COLDC10 COLDC9 COLDC8
COLDC7 COLDC6 COLDC5 COLDC4 COLDC3 COLDC2 COLDC1 COLDC0
R/W
R/W
31
15
—
R
0
0
7
0
R/W
R/W
30
14
—
R
0
0
6
0
R/W
R/W
29
13
—
R
0
0
5
0
R/W
R/W
. . .
. . .
. . .
. . .
12
0
4
0
R/W
R/W
19
11
—
R
0
0
3
0
R/W
R/W
18
10
—
R
0
0
2
0
R/W
R/W
17
—
R
0
9
0
1
0
R/W
R/W
16
—
R
0
8
0
0
0
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