PC87570 datasheet(12/168 Pages) NSC

12 / 168 page

Table of Contents

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16.2.8

Sampling Time ........................................................................................................... 121

16.2.9

Polling Driven Operation ............................................................................................ 121

16.2.10 Interrupt Driven Operation ......................................................................................... 121

16.2.11 Overflow .................................................................................................................... 121

16.3

OPERATION MODES ............................................................................................................. 122

16.4

ADC REGISTERS ................................................................................................................... 123

16.4.1

ADC Status Register (ADCST) .................................................................................. 123

16.4.2

ADC Control Register 1 (ADCCNT1) ......................................................................... 123

16.4.3

ADC Control Register 2 (ADCCNT2) ......................................................................... 123

16.4.4

ADC Control Register 3 (ADCCNT3) ......................................................................... 124

16.4.5

ADC Data Registers .................................................................................................. 125

16.5

USAGE HINTS ........................................................................................................................ 125

16.5.1

Power Supply and Layout Guidelines ........................................................................ 125

16.5.2

Power Consumption .................................................................................................. 125

16.5.3

Filtering the Noise on Input Signals ........................................................................... 126

16.5.4

AD0-7 Multiplexing with PD0-7 Port .......................................................................... 126

16.5.5

Calculating the Sampling Time .................................................................................. 126

17.0

Digital to Analog Converter (DAC)

17.1

FEATURES .............................................................................................................................. 127

17.2

FUNCTIONAL DESCRIPTION ................................................................................................ 127

17.2.1

DAC Reset ................................................................................................................. 127

17.2.2

Reference Voltage ..................................................................................................... 127

17.2.3

Output Signal Range ................................................................................................. 127

17.2.4

Initializing and Enabling the DAC .............................................................................. 128

17.2.5

Disabling the DAC ..................................................................................................... 128

17.2.6

Conversion Start ........................................................................................................ 128

17.3

DAC REGISTERS ................................................................................................................... 128

17.3.1

DAC Control Register (DACCTRL) ............................................................................ 128

17.3.2

DAC Data Registers .................................................................................................. 128

17.4

USAGE HINTS ........................................................................................................................ 128

17.4.1

Power Supply and Layout Guidelines ........................................................................ 128

17.4.2

Output Settling Time .................................................................................................. 129

17.4.3

Output Voltage Accuracy ........................................................................................... 129

17.4.4

Filtering Noise on Output Signals .............................................................................. 129

17.4.5

Current Consumption ................................................................................................ 129

17.4.6

Entering Idle Mode .................................................................................................... 129

18.0

Development System Support

18.1

ISE INTERRUPT ..................................................................................................................... 130

18.2

TRIS STRAP INPUT PIN ......................................................................................................... 130

18.3

FREEZING EVENTS ............................................................................................................... 130

18.3.1

Disabling Maskable Interrupts ................................................................................... 130

18.3.2

Freezing the WATCHDOG Counter .......................................................................... 130

18.3.3

Disabling Additional Modules .................................................................................... 130

18.3.4

Disabling Destructive Reads ..................................................................................... 130

PC87570 Datasheet(PDF) 12 Page - National Semiconductor (TI)

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