HT56RB688_13 datasheet(4/164 Pages) HOLTEK

4 / 164 page

Programming Considerations ...............................................................................57

Timer Program Example.......................................................................................58

Pulse Width Modulator .....................................................................59

PWM Overview ....................................................................................................59

8+4 PWM Mode Modulation .................................................................................60

PWM Output Control ............................................................................................60

PWM Register Pairs

- PWMnH/PWMnL (n=0~3) .................................................61

PWM Programming Example ...............................................................................61

Analog to Digital Converter..............................................................62

A/D Overview .......................................................................................................62

A/D Converter Data Registers

- ADRL, ADRH .....................................................62

A/D Converter Control Registers

- ADCR, ADPCR, ACSR ..................................63

A/D Input Pins ......................................................................................................65

Initialising the A/D Converter ................................................................................65

Programming Considerations ...............................................................................67

A/D Programming Example ..................................................................................67

A/D Transfer Function...........................................................................................69

Serial Interface Function - SIM ........................................................70

SPI Interface.........................................................................................................70

SPI Registers .......................................................................................................75

SPI Control Register

- SIMnCTL2 ........................................................................78

SPI Communication..............................................................................................79

2C Interface .........................................................................................................79

2C Address Register - SIMnAR ...........................................................................81

2C Bus Communication........................................................................................82

Peripheral Clock Output ...................................................................86

Peripheral Clock Operation...................................................................................86

Buzzer.................................................................................................87

PA0/PA1 Pin Function Control ..............................................................................87

Interrupts............................................................................................89

Interrupt Registers ................................................................................................90

Interrupt Operation ...............................................................................................93

Interrupt Priority.....................................................................................................93

External Interrupt ..................................................................................................94

External Peripheral Interrupt .................................................................................95

Timer/Event Counter Interrupt ..............................................................................95

A/D Interrupt .........................................................................................................96

Smart Card Interrupt.............................................................................................96

Smart Card Insertion/Removal Interrupt ...............................................................96

SIM (SPI/I

2C Interface) Interrupts .........................................................................96

Multi-function Interrupt ..........................................................................................97

Rev. 1.10

April 15, 2013

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