HT86R192 datasheet(21/44 Pages) HOLTEK

21 / 44 page

HT86R192

Rev. 0.00

October 23, 2006

Preliminary

Input/Output Ports

There are 23 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. Bit 7 which is mapped to location [17H] is

always written as

²1².

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,

16H) instructions.

Some instructions first input data and then follow the

output operations. For example,

²SET [m].i², ²CLR

[m].i

², ²CPL [m]², ²CPLA [m]² read the entire port states

into the CPU, execute the defined operations

(bit-operation), and then write the results back to the

latches or the accumulator.

Each line of port A has the capability of waking-up the

device. The wake-up capability of port A is determined

by OTP option. There is a pull-high option available for

all I/O lines. Once the pull-high option is selected, all I/O

lines have pull-high resistors. Otherwise, the pull-high

resistors are absent. It should be noted that a

non-pull-high I/O line operating in input mode will cause

a floating state.

By some different OTP options, there are 3 shared pins

(PC.4, PC.5, and PC.6) in PC. They can be normal I/O

pins or for special functions. The PC.4 is the external

clock source of timer/event counter TMR0 if TMR0 is set

to external clock mode, and the PC.5 is the external

clock source of timer/event counter TMR1 if TMR1 is set

to external clock mode. PC6 is pin-shared with XIN. The

XIN and XOUT can be connected to a 32kHz crystal as

the clock source of the timer counter TMR3 if the OTP

option is set to enable 32kHz (RTC) crystal.

Audio Output and Volume Control

- DAL, DAH, VOL

The HT86R192 provides one 12-bit voltage type DAC

device for driving external 8

W speaker through an exter-

nal NPN transistor. The programmer must write the

voice data to register DAL (27H) and DAH (28H). The

12-bit audio output will be written to the higher nibble of

DAL and the whole byte of DAH, and the DAL3~DAL0 is

always read as

²0H². There are 8 scales of volume con-

trollable level that are provided for the voltage type DAC

output. The programmer can change the volume by only

writing the volume control data to the higher-nibble of

the VOL (29H), and the lower-nibble of VOL (29H) is al-

ways read as

²0H².

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 I / O

R e a d I / O

S y s t e m W a k e - U p ( P A o n l y )

W e a k

P u l l - u p

P A 0 ~ P A 7

P B 0 ~ P B 7

P C 0 ~ P C 6

O p t i o n

V D D

C K

Input/Output Ports

HT86R192 Datasheet(PDF) 21 Page - Holtek Semiconductor Inc

HT86R192 Datasheet(HTML) 21 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Descarga

Enlace URL