參數(shù)資料
型號: W83C553F-G
英文描述: W83C553F-G Highly Integrated System I/O Controller for Power PCTM (South Bridge) QFP 208
中文描述: W83C553F接枝高度集成的系統(tǒng)I / O控制器的電力PCTM(南橋)QFP封裝208
文件頁數(shù): 107/159頁
文件大?。?/td> 3991K
代理商: W83C553F-G
W83C553F
Electrical Specifications
WINBOND SYSTEMS LABORATORY
104
Timer Control Register
Function
:
The Timer Control Register specifies the counter selection, operating mode, counter byte programming
order and count value size, and whether the counter counts down in a 16-bit or Binary Coded Decimal
(BCD) format. After writing the control word, a new count can be written at any time. The new value
will take effect according to the programmed mode.
Type
:
Bit Description
:
Bits [7:6]:
Bits [5:4]:
Write Only
SC[1:0]. These bits select the counter the control word acts upon as shown below.
Bit 7
Bit 6
Function
0
0
Counter 0 select
0
1
Counter 1 select
1
0
Counter 2 select
1
1
Read Back command
RW[1:0]. These bits are the read/write control bits. Actual counter programming is done
through the counter I/O port (40h, 41h, 42h for counters 0, 1 and 2, respectively).
Bit 5
Bit 4
Function
0
0
Counter Latch command
0
1
R/W Least Significant Byte (LSB)
1
0
R/W Most Significant Byte (MSB)
1
1
R/W LSB then MSB
M[2:0]. These bits select one of six possible modes of operation for the counter as shown
below.
Bit 3
Bit 2
Bit 1
Mode
0
0
0
0
0
0
1
1
x
1
0
2
x
1
1
3
1
0
0
4
1
0
1
5
Bits [3:1]:
Function
Out signal on end of count (=0)
Hardware retriggerable one shot
Rate generator (divide by n counter)
Square wave output
Software triggered strobe
Hardware triggered strobe
Bit 0:
BCD. When this bit is "0", a binary countdown is used. The largest possible binary count is
216. When this bit is "1", a Binary Coded Decimal (BCD) count is used. The largest BCD
count allowed is 104.
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