HT46R92 datasheet(16/61 Pages) HOLTEK

16 / 61 page

HT46R92

Rev. 1.10

November 5, 2008

Programming Considerations

Within the user program, one of the first things to con-

sider is port initialisation. After a reset, all of the I/O data

(except PC) and port control registers will be set high.

This means that all of the PC, PD and PE output pins will

be in a output floating condition. Also all the PA and PB

I/O pins will default to an input state, the level of which

depends on the other connected circuitry and whether

pull-high options have been selected. If the port control

registers, PAC and PBC, are then programmed to setup

some pins as outputs, these output pins will have an ini-

tial high output value unless the associated port data

registers, PA and PB, are first programmed. Selecting

which pins are inputs and which are outputs can be

achieved byte-wide by loading the correct values into

the appropriate port control register or by programming

individual bits in the port control register using the

²SET

[m].i

² and ²CLR [m].i² instructions. Note that when using

these bit control instructions, a read-modify-write opera-

tion takes place. The microcontroller must first read in

the data on the entire port, modify it to the required new

bit values and then rewrite this data back to the output

ports.

Port A has the additional capability of providing wake-up

functions. When the device is in the Power Down Mode,

various methods are available to wake the device up.

One of these is a high to low transition of any of the Port

A pins. Single or multiple pins on Port A can be setup to

have this function.

V D D

P A 0 / B Z

P A 1 / B Z

P A 2 / T M R

P A 3

P A 4 / P W M 0

P A 5 / P W M 1

P A 6

P A 7

W a k e - u p O p t i o n

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

C K

C o n t r o l B i t

P u l l - H i g h

O p t i o n

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

P W M o r B Z / B Z

P W M o r

B Z / B Z O p t i o n

T M R f o r P A 2 o n l y

PA Input/Output Ports

V D D

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

C o n t r o l B i t

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

P B 0 / A N 0

P B 1 / A N 1

P B 2 / A N 2

P B 3 / A N 3

P B 4 / A N 4

P B 5 / A N 5

P B 6

P B 7

C K

L C D E N

A C S 2 ~ A C S 0

T o A / D C o n v e r t e r

A n a l o g

I n p u t

S e l e c t o r

P C R 2

P C R 1

P C R 0

PB Input/Output Ports

HT46R92 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc

HT46R92 Datasheet(HTML) 16 Page - Holtek Semiconductor Inc

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