HT46R006 datasheet(20/72 Pages) HOLTEK

20 / 72 page

HT48R006/HT46R006

Rev. 1.00

October 24, 2011

Input/Output Ports and Control Registers

Within the area of Special Function Registers, the port

PA data I/O register and its associated control register

PAC plays a prominent role. This register is mapped to

specific address within the Data Memory as shown in

the Data Memory table. The data I/O registers, are used

to transfer the appropriate output or input data on the

port. The control registers specifies which pins of the

port are set as inputs and which are set as outputs. To

setup a pin as an input, the corresponding bit of the con-

trol register must be set high, for an output it must be set

low. During program initialisation, it is important to first

setup the control registers to specify which pins are out-

puts and which are inputs before reading data from or

writing data to the I/O ports. One flexible feature of these

registers is the ability to directly program single bits us-

ing the

²SET [m].i² and ²CLR [m].i² instructions. The

ability to change I/O pins from output to input and vice

versa by manipulating specific bits of the I/O control reg-

isters during normal program operation is a useful fea-

ture of these devices.

System Control Registers

- CTRL0, CTRL1

These registers are used to provide control over various

internal functions. Some of these include the PFD con-

trol, PWM control, certain system clock options, the LXT

Oscillator low power control, external Interrupt edge trig-

ger type, Watchdog Timer enable function, Time Base

function division ratio, and the LXT oscillator enable

control.

Wake-up Function Register

- PAWK

When the microcontroller enters the Sleep Mode, vari-

ous methods exist to wake the device up and continue

with normal operation. One method is to allow a falling

edge on the I/O pins to have a wake-up function. This

to have this wake-up function.

Pull-high Registers

- PAPU

The I/O pins, if configured as inputs, can have internal

pull-high resistors connected, which eliminates the need

for external pull-high resistors. This register selects which

I/O pins are connected to internal pull-high resistors.

· CTRL0 Register -- HT46R006

Bit

76543210

Name

PFDCS

PWMSEL

PWMC0

PFDC

LXTLP

CLKMOD

R/W

POR

0000

Bit 7

unimplemented, read as

²0²

Bit 6

PFDCS: PFD clock source

0: timer0

1: timer1

Bit 5

PWMSEL: PWM type selection

0: 6+2

1: 7+1

Bit 4

unimplemented, read as

²0²

Bit 3

PWMC0: I/O or PWM

0: I/O

1: PWM

Bit 2

PFDC: I/O or PFD

0: I/O

1: PFD

Bit 1

LXTLP: LXT oscillator low power control function

0: LXT Oscillator quick start-up mode

1: LXT Oscillator Low Power Mode

Bit 0

CLKMOD: system clock mode selection.

0: High speed - HIRC used as system clock

1: Low speed - LXT used as system clock, HIRC oscillator stopped.

These selections are only valid if the oscillator configuration options

have selected the HIRC+LXT.

Note:

If PWM output is selected by PWMC0 bit, fTP comes always from fSYS.

(fTP is the clock source for timer0, time base and PWM)

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