HT48C06 datasheet(14/38 Pages) HOLTEK

14 / 38 page

HT48R05A-1/HT48C05/HT48R06A-1/HT48C06

Rev. 1.10

June 9, 2004

V D D

P A 0 ~ P A 7

P B 0 ~ P B 2

P C 0 ~ P C 1

B Z E N

( P B 0 , P B 1 O n l y )

O P 0 ~ O P 7

T M R f o r P C 1 O n l y

I N T f o r P C 0 O n l y

S y s t e m W a k e - u p

( P A o n l y )

R e a d D a t a R e g i s t e r

P B 0

E X T

( P B 0 , P B 1 O n l y )

C K

C o n t r o l B i t

P U

D a t a B u s

W r i t e C o n t r o l R e g i s t e r

C h i p R e s e t

R e a d C o n t r o l R e g i s t e r

W r i t e D a t a R e g i s t e r

D a t a B i t

Input/Output Ports

transient occurs again. In other words, only one cycle

measurement can be done. Until setting the TON, the

cycle measurement will function again as long as it re-

ceives further transient pulse. Note that, in this operat-

ing mode, the timer/event counter starts counting not

according to the logic level but according to the transient

edges. In the case of counter overflows, the counter is

reloaded from the timer/event counter preload register

and issues the interrupt request just like the other two

modes. To enable the counting operation, the timer ON

bit (TON; bit 4 of TMRC) should be set to 1. In the pulse

width measurement mode, the TON will be cleared au-

tomatically after the measurement cycle is completed.

But in the other two modes the TON can only be reset by

instructions. The overflow of the timer/event counter is

one of the wake-up sources. No matter what the opera-

tion mode is, writinga0toETIcan disable the interrupt

service.

In the case of timer/event counter OFF condition, writing

data to the timer/event counter preload register will also

reload that data to the timer/event counter. But if the

timer/event counter is turned on, data written to it will

only be kept in the timer/event counter preload register.

The timer/event counter will still operate until overflow

occurs. When the timer/event counter (reading TMR) is

read, the clock will be blocked to avoid errors. As clock

blocking may results in a counting error, this must be

taken into consideration by the programmer.

The bit0~2 of the TMRC can be used to define the

pre-scaling stages of the internal clock sources of the

timer/event counter. The definitions are as shown. The

overflow signal of the timer/event counter can be used

to generate PFD signals for buzzer driving.

Input/Output Ports

There are 13 bidirectional input/output lines in the

microcontroller, labeled from PA to PC, which are

mapped to the data memory of [12H], [14H] and [16H]

respectively. All of these I/O ports can be used for input

and output operations. For input operation, these ports

are non-latching, that is, the inputs must be ready at the

T2 rising edge of instruction

²MOV A,[m]² (m=12H, 14H

or 16H). For output operation, all the data is latched and

remains unchanged until the output latch is rewritten.

Each I/O line has its own control register (PAC, PBC,

PCC) to control the input/output configuration. With this

control register, CMOS output or Schmitt trigger input

with or without pull-high resistor structures can be re-

configured dynamically (i.e. on-the-fly) under software

control. To function as an input, the corresponding latch

of the control register must write

²1². The input source

also depends on the control register. If the control regis-

ter bit is

²1², the input will read the pad state. If the con-

trol register bit is

²0², the contents of the latches will

move to the internal bus. The latter is possible in the

²read-modify-write² instruction.

For output function, CMOS is the only configuration.

These control registers are mapped to locations 13H,

15H and 17H.

After a chip reset, these input/output lines remain at high

levels or floating state (dependent on pull-high options).

Each bit of these input/output latches can be set or

cleared by

²SET [m].i² and ²CLR [m].i² (m=12H, 14H or

16H) instructions.

Some instructions first input data and then follow the

output operations. For example,

²SET [m].i², ²CLR

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