HT46R65 datasheet(18/48 Pages) HOLTEK

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HT46R65/HT46C65

Rev. 1.80

July 14, 2005

flow occurs, the counter is reloaded from the timer/event

counter preload register, and generates an interrupt re-

quest flag (T0F; bit 6 of INTC0, T1F; bit 4 of INTC1). In

the pulse width measurement mode with the values of

the T0ON/T1ON and T0E/T1E bits equal to 1, after the

TMR0 (TMR1) has received a transient from low to high

(or high to low if the T0E/T1E bit is

²0²), it will start count-

ing until the TMR0 (TMR1) returns to the original level

and resets the T0ON/T1ON. The measured result re-

mains in the timer/event counter even if the activated

transient occurs again. In other words, only 1-cycle

measurement can be made until the T0ON/T1ON is set.

The cycle measurement will re-function as long as it re-

ceives further transient pulse. In this operation mode,

the timer/event counter begins counting not according

to the logic level but to the transient edges. In the case of

counter overflows, the counter is reloaded from the

timer/event counter register and issues an interrupt re-

quest, as in the other two modes, i.e., event and timer

modes.

Bit No.

Label

Function

T0PSC0

T0PSC1

T0PSC2

To define the prescaler stages.

T0PSC2, T0PSC1, T0PSC0=

000: fINT=fSYS

001: fINT=fSYS/2

010: fINT=fSYS/4

011: fINT=fSYS/8

100: fINT=fSYS/16

101: fINT=fSYS/32

110: fINT=fSYS/64

111: fINT=fSYS/128

T0E

Defines the TMR0 active edge of the timer/event counter:

In Event Counter Mode (T0M1,T0M0)=(0,1):

1:count on falling edge;

0:count on rising edge

In Pulse Width measurement mode (T0M1,T0M0)=(1,1):

1: start counting on the rising edge, stop on the falling edge;

0: start counting on the falling edge, stop on the rising edge

T0ON

Enable/disable timer counting (0=disabled; 1=enabled)

Unused bit, read as

²0²

T0M0

T0M1

Defines the operating mode T0M1, T0M0=

01= Event count mode (External clock)

10= Timer mode (Internal clock)

11= Pulse Width measurement mode (External clock)

00= Unused

TMR0C (0EH) Register

Bit No.

Label

Function

0~2

Unused bit, read as

²0²

T1E

Defines the TMR1 active edge of the timer/event counter:

In Event Counter Mode (T1M1,T1M0)=(0,1):

1:count on falling edge;

0:count on rising edge

In Pulse Width measurement mode (T1M1,T1M0)=(1,1):

1: start counting on the rising edge, stop on the falling edge;

0: start counting on the falling edge, stop on the rising edge

T1ON

Enable/disable timer counting (0= disabled; 1= enabled)

T1S

Defines the TMR1 internal clock source (0=fSYS/4; 1=32768Hz)

T1M0

T1M1

Defines the operating mode T1M1, T1M0=

01= Event count mode (External clock)

10= Timer mode (Internal clock)

11= Pulse Width measurement mode (External clock)

00= Unused

TMR1C (11H) Register

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