HT95R65 datasheet(21/82 Pages) HOLTEK

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HT95R64/HT95R65

Rev. 1.00

March 3, 2010

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

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

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

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 A 0 ~ P A 7

W e a k

P u l l - u p

C K

V D D

PA Input/Output Port

TMR0/1 pins

Pin PC4 and PC6 are pin-shared with the external timer

input pin TMR0 and TMR1 respectively. For these

pin-shared pins to function as timer inputs, the corre-

sponding control bits in the timer control register must be

correctly set. For applications that do not require an ex-

ternal timer input, the pin can be used as a normal I/O pin.

Note that if used as a normal I/O pin the timer mode con-

trol bits in the timer control register must select the timer

mode, which has an internal clock source, to prevent the

input pin from interfering with the timer operation.

Programming Considerations

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

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

and port control registers will be set high. This means

that all 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, PCC, PDC, PEC and PFC, are

then programmed to setup some pins as outputs, these

output pins will have an initial high output value unless

the associated port data registers, PA, PC, PD, PE and

PF, are first programmed. Selecting which pins are in-

puts 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].i² and ²CLR

[m].i

² instructions. Note that when using these bit control

instructions, a read-modify-write operation takes place.

The microcontroller must first read in the data on the en-

tire port, modify it to the required new bit values and then

rewrite this data back to the output ports.

T 1

T 2

T 3

T 4

T 1

T 2

T 3

T 4

W r i t e t o P o r t

R e a d f r o m P o r t

S y s t e m C l o c k

P o r t D a t a

Read/Write Timing

V D D

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

W e a k

P u l l - u p

P C 0 , P C 1 , P C 4 ~ P C 7

P D 0 ~ P D 7

P E 0 ~ P E 7

P F 0 ~ P F 7

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

M F I ( P C 0 ¯ , P C 5 ¯ , P C 7 o n l y )

PC (Except for PC2 and PC3), PD and PE Input/Output Ports

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