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SAA5496H Datasheet(PDF) 11 Page - NXP Semiconductors |
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SAA5496H Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 68 page 1997 Jul 07 11 Philips Semiconductors Preliminary specification Economy teletext and TV microcontrollers SAA5x9x family 7.3.5 6-BIT PWM DACS 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) 76543210 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. 6 − Not used. 5 PV5 The output of the PWM is a pulse of period 21.33 µs with a pulse HIGH time determined by the binary value of these 6-bits multiplied by 0.33 µs. PV5 is the most significant bit. 4 PV4 3 PV3 2 PV2 1 PV1 0 PV0 |
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