NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 356
NHE6300ESB S L7XJ
Manufacturer Part Number
NHE6300ESB S L7XJ
Description
Manufacturer
Intel
Datasheet
1.NHE6300ESB_S_L7XJ.pdf
(848 pages)
Specifications of NHE6300ESB S L7XJ
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8.3.1
Table 232. TCW —Timer Control Word Register
Intel
DS
356
Bits
Default Value:
7:6
5:4
3:1
I/O Address:
0
®
6300ESB I/O Controller Hub
Note: This register is programmed prior to any counter being accessed to specify counter
Note: There are two special commands that may be issued to the counters through this
Device:
Counter Mode Selection
Binary/BCD Countdown
Read/Write Select
Counter Select
TCW —Timer Control Word Register
modes. Following part reset, the control words for each register are undefined and each
counter output is 0. Each timer must be programmed to bring it into a known state.
register, the Read Back Command and the Counter Latch Command. When these
commands are chosen, several bits within this register are redefined. These register
formats are described below.
31
43h
All bits undefined
Name
Select
The Counter Selection bits select the counter the control word
acts upon as shown below. The Read Back Command is
selected when bits[7:6] are both 1.
00 = Counter 0 select
01 = Counter 1 select
10 = Counter 2 select
11 = Read Back Command
These bits are the read/write control bits. The actual counter
programming is done through the counter port (40h for
counter 0, 41h for counter 1, and 42h for counter 2).
00 = Counter Latch Command
01 = Read/Write Least Significant Byte (LSB)
10 = Read/Write Most Significant Byte (MSB)
11 = Read/Write LSB then MSB
These bits select one of six possible modes of operation for
the selected counter.
000 = Mode 0Out signal on end of count (=0)
001 = Mode 1Hardware retriggerable one-shot
x10 = Mode 2Rate generator (divide by n counter)
x11 = Mode 3Square wave output
100 = Mode 4Software triggered strobe
101 = Mode 5Hardware triggered strobe
0 = Binary countdown is used. The largest possible binary
count is 2 16
1 = Binary coded decimal (BCD) count is used. The largest
possible BCD count is 10 4
Description
Attribute:
Function:
Size:
0
Write-Only
8-bit
Order Number: 300641-004US
Intel
®
6300ESB ICH—8
November 2007
Access
WO
WO
WO
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