HT85F2270 datasheet(5/226 Pages) HOLTEK

5 / 226 page

Rev. 1.00

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�a� 1�� 01�

Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

26 Input/Output Ports............................................................................................ 118

Input/Output Port Overview............................................................................................. 118

Register Description........................................................................................................ 119

Pn�0/Pn�1 Registers – Port �ode Registers........................................................................... 1�1

P0WAKE Register – Port 0 Wake-up ......................................................................................... 1��

SRCR Register – Slew Rate Control.......................................................................................... 1��

I/O Pin Structures............................................................................................................ 1�4

Quasi-bidirectional I/O – All Ports............................................................................................... 1�4

Push-pull Output – Ports 0~� Onl�............................................................................................. 1��

Open-drain Output – Ports 0~� Onl�.......................................................................................... 1��

Input Onl� – Ports 0~� Onl� ....................................................................................................... 1��

Programming Considerations.......................................................................................... 1�6

27 Timer/Event Counters ...................................................................................... 127

Timer/Event Counter Summar�....................................................................................... 1�7

28 Timer/Event Counters 0, 1, 3 ........................................................................... 128

Introduction...................................................................................................................... 1�8

Timer 0/Timer 1/Timer � Register Description................................................................. 1�9

�ode 0 – 1�-bit Counter/Timer �ode Operation............................................................. 1�6

�ode 1 – 16-bit Counter/Timer �ode Operation............................................................. 1�6

�ode � – 8-bit Auto-reload Counter/Timer �ode Operation ........................................... 1�7

�ode � – Two 8-Bit Timers/Counters �ode Operation – Timer 0 Onl�........................... 1�8

29 Timer 2 with Additional 4-channel PCA.......................................................... 139

Introduction...................................................................................................................... 1�9

Timer � ............................................................................................................................ 141

Timer function............................................................................................................................. 141

Event Counter function............................................................................................................... 141

Gated Timer function .................................................................................................................. 141

Timer � with PCA............................................................................................................. 14�

Timer � Register Description........................................................................................... 14�

Capture �odes................................................................................................................ 146

Capture On Edge �ode.............................................................................................................. 146

Capture On Write �ode.............................................................................................................. 146

Compare �odes.............................................................................................................. 147

Compare �ode 0........................................................................................................................ 147

Compare �ode 1........................................................................................................................ 149

Reload �ode................................................................................................................... 1�1

Programmable Clock Output �ode................................................................................. 1��

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