Intel 8XC196NT, User Manual

Page: 251 / 597

8XC196NT USER’S MANUAL
10-18
T1CONTROL
Address:
Reset State:
1F98H
00H
The timer 1 control (T1CONTROL) register determines the clock source, counting direction, and 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 the timer. From reset, the timers are
disabled and not free running.
0 = disables timer
1 = enables timer
6 UD Up/Down
This bit determines the timer counting direction, in selected 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 and direction control
source.
M2 M1 M0 Clock Source Direction Source
0 0 0 F
OSC
/4 UD bit (T1CONTROL.6)
X 0 1 T1CLK Pin
†
UD bit (T1CONTROL.6)
0 1 0 F
OSC
/4 T1DIR Pin
0 1 1 T1CLK Pin
†
T1DIR Pin
1 1 1 quadrature clocking using T1CLK and T1DIR pins
†
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 clock prescaler value.
P2 P1 P0 Prescaler Resolution
†
0 0 0 divide by 1 (disabled) 200 ns
0 0 1 divide by 2 400 ns
0 1 0 divide by 4 800
0 1 1 divide by 8 1.6 µs
1 0 0 divide by 16 3.2 µs
1 0 1 divide by 32 6.4 µs
1 1 0 divide by 64 12.8 µs
1 1 1 reserved —
†
At 20 MHz.
Figure 10-8. Timer 1 Control (T1CONTROL) Register