HT83F02 datasheet(18/64 Pages) HOLTEK

18 / 64 page

HT83F02

Rev. 1.20

November 19, 2010

Interrupt Control Register

- INTC, INTCH

Two 8-bit register, known as the INTC and INTCH regis-

ters, controls the operation of both external and internal

timer interrupts. By setting various bits within these reg-

isters using standard bit manipulation instructions, the

enable/disable function of the external and timer inter-

rupts can be independently controlled. A master inter-

rupt bit within this register, the EMI bit, acts like a global

enable/disable and is used to set all of the interrupt en-

able bits on or off. This bit is cleared when an interrupt

routine is entered to disable further interrupt and is set

by executing the

²RETI² instruction.

Note: In situations where other interrupts may require

servicing within present interrupt service rou-

tines, the EMI bit can be manually set by the pro-

gram after the present interrupt service routine

has been entered.

Timer Registers

All devices contain two 8-bit Timers whose associated

registers are known as TMR0 and TMR1 which is the lo-

cation where the associated timer's 8-bit value is lo-

cated. Their associated control registers, known as

TMR0C and TMR1C, contain the setup information for

these timers.

Note that all timer registers can be directly written to in

order to preload their contents with fixed data to allow

different time intervals 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 and PC. 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 and PCC,

also mapped to specific addresses with the Data Mem-

ory. 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 control

low. During program initialization, 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.

Port C Pull-high Control Register

- PCPHC

Port C pull-high control register, PCPHC, is used to set

the Port C pull high function.

T O

P D F

O V

A C

S T A T U S R e g i s t e r

A r i t h m e t i c / L o g i c O p e r a t i o n F l a g s

C a r r y f l a g

A u x i l i a r y c a r r y f l a g

Z e r o f l a g

O v e r f l o w f l a g

S y s t e m M a n a g e m e n t F l a g s

P o w e r d o w n f l a g

W a t c h d o g t i m e - o u t f l a g

N o t i m p l e m e n t e d , r e a d a s " 0 "

b 7

b 0

Status Register

P C P H C R e g i s t e r

b 7

b 0

C o n t r o l t h e P o r t C P u l l - H i g h

1 : e n a b k e

0 : d i s a b l e - d e f a u l t

N o t i m p l e m e n t e d , r e a d a s " 0 "

P C P H C 0

P C P H C 1

P C P H C 2

Port C Pull-High Control Register

HT83F02 Datasheet(PDF) 18 Page - Holtek Semiconductor Inc

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