HT46C65 Holtek Semiconductor, HT46C65 Datasheet - Page 18

• Manufacturer Part Number: HT46C65
• Description: A/D with LCD Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

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 0 ), 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
Rev. 1.80
Bit No.
Bit No.
0~2
0
1
2
3
4
5
6
7
3
4
5
6
7
T0PSC0
T0PSC1
T0PSC2
Label
T0ON
T0M0
T0M1
Label
T1ON
T1M0
T1M1
T0E
T1E
T1S
To define the prescaler stages.
T0PSC2, T0PSC1, T0PSC0=
000: f
001: f
010: f
011: f
100: f
101: f
110: f
111: f
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
Enable/disable timer counting (0=disabled; 1=enabled)
Unused bit, read as 0
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
Unused bit, read as 0
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
Enable/disable timer counting (0= disabled; 1= enabled)
Defines the TMR1 internal clock source (0=f
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
INT
INT
INT
INT
INT
INT
INT
INT
=f
=f
=f
=f
=f
=f
=f
=f
SYS
SYS
SYS
SYS
SYS
SYS
SYS
SYS
/2
/4
/8
/16
/32
/64
/128
TMR0C (0EH) Register
TMR1C (11H) Register
18
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.
Function
Function
SYS
/4; 1=32768Hz)
HT46R65/HT46C65
July 14, 2005