HT86B50 datasheet(34/83 Pages) HOLTEK

34 / 83 page

HT86BXX/HT86BRXX

Rev. 1.70

February 22, 2010

Timer Registers

Depending upon which device is selected, all devices

contain three or four integrated Timers of either 8-bit or

16-bit size. All devices contain three 8-bit Timers whose

associated registers are known as TMR0, TMR1 and

TMR3, which is the location where the associated

timer's 8-bit value is located. Their associated control

registers, known as TMR0C, TMR1C and TMR3C, con-

tain the setup information for these timers. Some de-

vices also contain an additional 16-bit timer whose

the location where the timer's 16-bit value is located. An

associated control register, known as TMR2C, contains

the setup information for this timer. Note that all timer

registers can be directly written to in order to preload

their contents with fixed data to allow different time inter-

vals to be setup.

Input/Output Ports and Control Registers

Within the area of Special Function Registers, the I/O

registers and their associated control registers play a

prominent role. All I/O ports have a designated register

correspondingly labeled as PA, PB, PD, etc. These la-

beled I/O registers are mapped to specific addresses

within the Data Memory as shown in the Data Memory

table, which are used to transfer the appropriate output

or input data on that port. With each I/O port there is an

associated control register labeled PAC, PBC, PDC,

etc., also mapped to specific addresses with the Data

Memory. The control register specifies which pins of that

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

registers during normal program operation is a useful

feature of these devices.

Voice ROM Data Address Latch Counter Registers

These are the LATCH0H/LATCH0M/LATCH0L,

LATCH1H/LATCH1M/LATCH1L and the Voice ROM

data registers. The voice ROM data address latch coun-

ter provides the handshaking between the

microcontroller and the voice ROM, where the voice

codes are stored. Eight bits of voice ROM data will be

addressed by using the 22-bit address (except for the

HT86B03 which has only 18-bits) latch counter, which is

composed of LATCH0H/LATCH0M/LATCH0L or

LATCH1H/LATCH1M/LATCH1L. After the 8-bit voice

ROM data is addressed, several instruction cycles of at

least 4us at least, will be required to latch the voice ROM

data, after which the microcontroller can read the voice

data from LATCHD.

Voice Control and Audio output Registers

VOICEC, DAL, DAH, VOL

The device includes a single 12-bit current type DAC

function for driving an external 8

W speaker through an

external NPN transistor. The programmer must write the

voice data to the DAL/DAH registers.

Pulse Width Modulator Registers

PWMC, PWML, PWMH

Each device contains a single 12-bit PWM function for

driving an external 8

W speaker. The programmer must

write the voice data to PWML/PWMH register.

Analog Switch Registers

- ASCR

Some devices, include 8 analog switch lines, which

have an associated register, known as ASCR, for their

setup and control.

External RC Oscillation Converter Registers

RCOCCR, RCOCR, TMR4L, TMR4H

For the HT86B40/HT86B50/HT86B60/HT86BR60/

HT86B70/ HT86B80/HT86B90 devices, which have two

16-bit programmable timers, the TMR4L and TMR4H

registers are for one of the 16-bit timers. The RCOCCR

and RCOCR registers are the control registers for the

external RC oscillator.

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