HT48R064 datasheet(48/93 Pages) HOLTEK

48 / 93 page

HT48R063/064/065/066/0662/067

Rev. 1.10

June 9, 2009

· PFD Programming Example

org 04h

; external interrupt vector

org 08h

; Timer Counter 0 interrupt vector

jmp tmr0int

; jump here when Timer 0 overflows

org 20h

; main program

;internal Timer 0 interrupt routine

tmr0int:

; Timer 0 main program placed here

begin:

;setup Timer 0 registers

mov

a,09bh

; setup Timer 0 preload value

mov tmr0,a

mov a,081h

; setup Timer 0 control register

mov tmr0c,a

; timer mode and prescaler set to /2

;setup interrupt register

mov a,00dh

; enable master interrupt and both timer interrupts

mov intc0,a

set tmr0c.4

; start Timer 0

Time Base

The device includes a Time Base function which is used to generate a regular time interval signal.

The Time Base time interval magnitude is determined using an internal 13 stage counter sets the division ratio of the

clock source. This division ratio is controlled by both the TBSEL0 and TBSEL1 bits in the CTRL1 register. The clock

source is selected using the T0S bit in the TMR0C register.

When the Time Base time out, a Time Base interrupt signal will be generated. It should be noted that as the Time Base

clock source is the same as the Timer/Event Counter clock source, care should be taken when programming.

HT48R064 Datasheet(PDF) 48 Page - Holtek Semiconductor Inc