Contents
Special Purpose Data Memory.........................................................22
Special Function Registers...................................................................................23
Wake-up Function Register - PAWK, PCWK........................................................28
Pull-high Registers - PAPU, PBPU, PCPU, PDPU, PEPU, PFPU........................28
Software COM Register - SCOMC.......................................................................28
Oscillator............................................................................................28
System Oscillator Overview..................................................................................28
System Clock Configurations................................................................................29
External Crystal/Resonator Oscillator - HXT ........................................................29
External RC Oscillator - ERC...............................................................................30
Internal RC Oscillator - HIRC...............................................................................30
External 32768Hz Crystal Oscillator - LXT...........................................................31
LXT Oscillator Low Power Function......................................................................31
Internal Low Speed Oscillator - LIRC...................................................................32
Operating Modes...............................................................................32
Mode Types and Selection ...................................................................................32
Mode Switching....................................................................................................34
Standby Current Considerations...........................................................................34
Wake-up...............................................................................................................35
Watchdog Timer ................................................................................36
Watchdog Timer Operation...................................................................................36
Reset and Initialisation .....................................................................38
Reset Functions ...................................................................................................38
Reset Initial Conditions.........................................................................................41
Input/Output Ports.............................................................................44
Pull-high Resistors................................................................................................44
I/O Port Wake-up..................................................................................................44
I/O Port Control Registers.....................................................................................46
Pin-shared Functions............................................................................................46
Pin Remapping Configuration - HT46R0662G .....................................................49
I/O Pin Structures .................................................................................................49
Programming Considerations ...............................................................................49
Timer/Event Counters.......................................................................50
Configuring the Timer/Event Counter Input Clock Source.....................................50
Timer Registers - TMR0, TMR1 ...........................................................................50
Timer Control Registers - TMR0C, TMR1C..........................................................52
Timer Mode ..........................................................................................................53
Event Counter Mode.............................................................................................54
Pulse Width Capture Mode...................................................................................54
Prescaler..............................................................................................................55
PFD Function .......................................................................................................55
Rev. 1.00
iii
March 3, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
