參數(shù)資料
型號： T9000
英文描述： ISDN Network Termination Node (NTN) Device
中文描述： ISDN網(wǎng)絡終端節(jié)點（新界北）設備
文件頁數(shù)： 100/126頁
文件大小： 2127K
代理商： T9000
100
Lucent Technologies Inc.
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
T9000
12 PWM Module
(continued)
12.5 PWM Powerdown Mode
Each PWM generator can be powered down by setting PWxCF (PwxE) register bit to 0.
12.6 PWM Module Register Set
Table 104. PW0CF: Pulse-Width Modulator 0 Configuration (0x44)
Reg
PW0CF
RESET
R/W
R/W
Default
Bit 7
PW0_E
0
Bit 6
Bit 5
PW0IE
0
Bit 4
PW0G.2
—
Bit 3
PW0G.1
—
Bit 2
PW0G.0
—
Bit 1
PW0R.1
—
Bit 0
PW0R.0
—
PW0AUTO
—
Bit #
7
Symbol
PW0_E
Name/Description
PWM
0 Enable.
0: Powerdown mode. PWMO0 output is maintained at 0.
1: Pulse-width modulator enabled. In a normal operation, this register should be set
after defining PP0.
PWM
0 Auto/Manual Operation Mode.
6
PW0AUTO
0: Manual/timer operation mode.
1: Sine modulator activated.
PWM
0 Interrupt Enable.
5
PW0IE
0: Interrupt disabled.
1: Interrupt enabled.
PWM
0 Granularity.
This parameter defines the granularity of the output pulse; i.e., the
minimum pulse width at high (tick0). Pulse period and pulse width are multiples of the
tick0 value (see pulse-width range below).
4—2
PW0G.[2:0]
000: Granularity = 1
001: Granularity = 2
010: Granularity = 4
011: Granularity = 8
1XX: Granularity = 16
PWM
0 Range.
This parameter defines the number of different values the pulse width can
take. Pulse period (PP0) is a function of the pulse-width granularity and the pulse-width
range, as follows:
tick0 = 65 ns.
tick0 = 130 ns.
tick0 = 260 ns.
tick0 = 521 ns.
tick0 = 1042 ns.
1—0
PW0R.[1:0]
00: Range = 32
01: Range = 64
10: Range = 128
11: Range = 256
PP0 = 32 * tick ns.
PP0 = 64 * tick ns.
PP0 = 128 * tick ns.
PP0 = 256 * tick ns.
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