參數資料
型號: SAA5291H
廠商: NXP Semiconductors N.V.
英文描述: Economy teletext and TV microcontrollers
中文描述: 經濟圖文電視和電視微控制器
文件頁數: 11/68頁
文件大?。?/td> 612K
代理商: SAA5291H
1997 Jul 07
11
Philips Semiconductors
Preliminary specification
Economy teletext and TV microcontrollers
SAA5x9x family
7.3.5
6-
BIT
PWM DAC
S
Eight 6-bit DACs are available to allow direct control of analog parts of the television.
Each low resolution 6-bit DAC is controlled by its associated Special Function Register (PWM0 to PWM7). The PWM
outputs are alternative functions of Port 2 and Port 3.4. The PWE bit in the SFR for the port corresponding to the PWM
should be set to logic 1 for correct operation of the PWM, e.g. if PWM0 is to be used, P2.1 should be set to logic 1 setting
the port pin to high-impedance.
7.3.5.1
Pulse Width Modulator Registers (PWM0 to PWM7)
Table 3
Pulse Width Modulator Registers (see Table 10 for addresses)
Table 4
Description of PWMn bits (n = 0 to 7)
7
6
5
4
3
2
1
0
PWE
PV5
PV4
PV3
PV2
PV1
PV0
BIT
SYMBOL
DESCRIPTION
7
PWE
If PWE is set to a logic 1, the corresponding PWM is active and controls its assigned
port pin. If PWE is set to a logic 0, the port pin is controlled by the corresponding bit in
the port SFR.
Not used.
The output of the PWM is a pulse of period 21.33
μ
s with a pulse HIGH time determined
by the binary value of these 6-bits multiplied by 0.33
μ
s. PV5 is the most significant bit.
6
5
4
3
2
1
0
PV5
PV4
PV3
PV2
PV1
PV0
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