Intel 8XC196MC, 8XC196MD, 8XC196MH 11-16, Figure 11-8. Timer 1 Control (T1CONTROL) Register

8XC196MC, MD, MH USER’S MANUAL
11-16
T1CONTROL Address:
Reset State: 1F78H 00H
The timer 1 control (T1CONTROL) register dete rmines the clock source, counting direction, a nd count
rate for timer 1.
7 0
CE UD M2 M1 M0 P2 P1 P0
Bit
Number Bit Mnemonic Function
7 CE Counter Enable
This bit enables or disables t he timer. From reset, the timers are
disabled and not free running.
0 = disables timer
1 = enables timer
6 UD Up/Down
This bit determin e s th e tim e r cou nti ng direction, in se le ct ed modes (see
mode bits, M2:0).
0 = count down
1 = count up
5:3 M2:0 EPA Clock Direction Mode Bits
These bits determine the timer clocking source a nd direction control
source.
M2 M1 M0 Clock Source Direction Source
000F
XTAL1/4 UD bit (T1CONTROL.6)
X 0 1 T1CLK pin†UD bit (T1CONTROL.6)
010F
XTAL1/4 T1DIR pin
011T1CLK pin
†T1DIR pin
111quadrature clocking using T1CLK and T1DIR
†If an external clock is selected, the timer counts on both the rising
and falling edges of the clock.
2:0 P2:0 EPA Clock Prescaler Bits
These bits determine the clo ck prescaler value.
P2 P1 P0 Pres ca ler Divi so r Resolution†
000divide by 1 (disabled) 250 ns
001divide by 2 500 ns
010divide by 4 1 µs
011divide by 8 2 µs
100divide by 16 4 µs
101divide by 32 8 µs
110divide by 64 16 µs
111enable T1RELOAD —
†At 16 MHz. Use the f ormula on page 11-6 to calcul ate the resolution
at other frequen cies.
Figure 11-8. Timer 1 Control (T1CONTROL) Register