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)： 103/126頁
文件大?。?/td> 2127K
代理商： T9000
Lucent Technologies Inc.
103
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
T9000
12 PWM Module
(continued)
12.6 PWM Module Register Set
(continued)
Table 108. PW1VH: Pulse-Width Modulator 1 Pulse-Width Value, High Byte (0x48)
Table 109. PW1VL: Pulse-Width Modulator 1 Pulse-Width Value, Low Byte (0x49)
Table 110
.
PWIR: Pulse-Width Modulator Interrupt Register (0x4A)
Note:
All bits in this register are set to 1 upon occurrence of the corresponding interrupt condition, and are cleared
to 0 when the register is read.
Reg
PW1VH
RESET
R/W
R/W
Default
Bit 7
PW1VH7
—
Bit 6
PW1VH6
—
Bit 5
PW1VH5
—
Bit 4
PW1VH4
—
Bit 3
PW1VH3
—
Bit 2
PW1VH2
—
Bit 1
PW1VH1
—
Bit 0
PW1VH0
—
Bit #
7—0
Symbol
PW1VH[7:0]
Name/Description
PWM
1 Pulse-Width Value, High Byte.
When manual pulse-width control is pro-
grammed, the pulse-width high can be expressed as follows:
PW1 = PW1VH[7:0] * tick when PW1R.[1:0] = 11.
PW1 = PW1VH[7:1] * tick when PW1R.[1:0] = 10.
PW1 = PW1VH[7:2] * tick when PW1R.[1:0] = 01.
PW1 = PW1VH[7:3] * tick when PW1R.[1:0] = 00.
If auto mode is selected, it contains the high-order byte of the programmed sine fre-
quency (Fs).
Reg
PW1VL
RESET
R/W
R/W
Default
Bit 7
PW1VL7
—
Bit 6
PW1VL6
—
Bit 5
PW1VL5
—
Bit 4
PW1VL4
—
Bit 3
PW1VL3
—
Bit 2
PW1VL2
—
Bit 1
PW1VL1
—
Bit 0
PW1VL0
—
Bit #
7—0
Symbol
PW1VL[7:0]
Name/Description
PWM
#
1 Pulse-Width Value, Low Byte.
Its function depends on the operation mode
selected.
When auto operation mode is selected (PW1CF[PW1AUTO] = 1), it contains the low-
order byte of the programmed sine frequency (Fs).
When manual/timer operation mode is selected (PW1CF[PW1AUTO] = 0), it defines the
rate at which PWIR[PW1I] interrupt register bit will be asserted:
PWIR[PW1I] assertion rate = PP1 x (PW1VL + 1).
Reg
PWIR
RESET
R/W
R
Default
Bit 7
—
—
Bit 6
—
—
Bit 5
—
—
Bit 4
—
—
Bit 3
—
—
Bit 2
—
—
Bit 1
PW1I
0
Bit 0
PW0I
0
Bit #
7—2
1—0
Symbol
—
PWxI
Name/Description
Reserved.
PWM
x Interrupt.
This interrupt occurs only in manual/timer mode (PWxAUTO = 0).
Once the current PWV value initiates the PWM output waveform, this interrupt is
asserted to indicate to the microcontroller that it should load a new value within
PPx * (PWxVL + 1) ns. If the microcontroller does not load a new value within this win-
dow, the previously loaded value will be used to generate the new pulse. PWxCF[PWxIE]
is the enable bit for this interrupt.
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