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參數(shù)資料
| 型號(hào)： | SAA7780 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | ThunderBird Q3DE PCI Audio Accelerator(雷鳥 Q3DE PCI音頻加速器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP160 |
| 封裝： | 28 X 28 MM, 3.42 MM HEIGHT, PLASTIC, QFP-160 |
| 文件頁數(shù)： | 65/70頁 |
| 文件大小： | 348K |
| 代理商： | SAA7780 |
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ThunderBird Q3D PCI Audio
Accelerator
SAA7780
Philips Semiconductors
Product Specification
1999 Sep 30
65
Multimedia Timer I/O Space Registers
Multimedia Timer Status Register - TMSTAT (RW/RO)
Multimedia Timer Count Registers
There are three registers required to hold the timer value. These three registers can be read at different cycles, It is
recommended that the least significant byte be read first for the most accuracy.
Multimedia Timer Count Register 2 - TMCOUNT2 (RW/RO)
2
FSTCLK
RW
Fast clock enable. When set, the timer counter will use the PCI clock instead
of the 1 micro second timer clock. This function will reduce the simulation and
test time of the timer.
1
TMRRST
RW
Timer reset. When set, this bit holds the multimedia timer in reset. The
multimedia timer is also reset by the system reset.
0
R
RO
Reserved. This bit returns a zero.
SONGBASE
D7
D6
D5
D4
D3
D2
D1
D0
Offset 00h
R
R
R
R
TPLD
TRE-
SUME
TMINT
TINTEN
POR Value
0
0
0
0
0
0
0
0
Bit
Name
R/W
Function
7:4
R
RO
Reserved. These bits return zeros.
3
TPLD
RW
Timer preload indicator. When set, this indicates the timer will start counting
from the values set in the timer count registers. When cleared, the timer will
start counting from zero or its last value when stopped
2
TRESUME
RW
Timer resume. When set, the timer will resume counting at the next 1uS
clock edge. When cleared, the timer will stop counting.
1
TMINT
RC
Timer interrupt. When asserted, the multimedia timer has flagged an interrupt
when the timer has counted to zero. The timer will continue to count. Writing
a one to this bit will clear the interrupt.
0
TINTEN
RW
Timer interrupt enable. When set, the multimedia timer will generate an
interrupt.
SONGBASE
D7
D6
D5
D4
D3
D2
D1
D0
Offset 03h
R
R
R
R
TMCOUNT2[7:0]
POR Value
0
0
0
0
0
0
0
0
Bit
Name
R/W
Function
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