GMS81C1404 Datasheet, PDF (47/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C1404/GMS81C1408
13.2 16-bit Timer/Counter Mode
The Timer register is being run with 16 bits. A 16-bit timer/
counter register T0, T1 are increased from 0000_H until it
matches TDR0, TDR1 and then resets to 0000_H. The
match output generates Timer 0 interrupt not Timer 1 in-
terrupt.
The clock source of the Timer 0 is selected either internal
or external clock by bit T0CK2, T0CK1 and T0SL0.
In 16-bit mode, the bits T1CK1,T1CK0 and 16BIT of TM1
should be set to “1” respectively.
TM0
ADDRESS : D0H
-
-
CAP0 T0CK2 T0CK1 T0CK0 T0CN T0ST
RESET VALUE : --000000
-
-
0
X
X
X
X
X
TM1
POL
16BIT PWME CAP1 T1CK1 T1CK0 T1CN T1ST
ADDRESS : D2H
RESET VALUE : 00000000
X
1
0
0
1
1
X
X
X: The value “0” or “1” corresponding your operation.
T0CK[2:0]
Edge Detector
T0ST
0 : Stop
1 : Clear and Start
EC0
÷2
÷4
÷8
fxin
÷ 32
÷ 128
÷ 512
÷ 2048
MUX
1
T0CN
T1 (8-bit)
T0 (8-bit)
CLEAR
COMPARATOR
TDR1 (8-bit) TDR0 (8-bit)
T0IF
F/F
TIMER 0
INTERRUPT
COMP0 PIN
Figure 13-5 16-bit Timer / Counter Mode
13.3 8-bit Compare Output (16-bit)
The GMS81C1404 and GMS81C1408 has a function of
Timer Compare Output. To pulse out, the timer match can
goes to port pin(COMP0) as shown in Figure 13-2 and Fig-
ure 13-5 . Thus, pulse out is generated by the timer match.
These operation is implemented to pin, RB4/COMP0/
PWM.
This pin output the signal having a 50: 50 duty square
wave, and output frequency is same as below equation.
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In this mode, the bit PWMO of RB function register (RB-
FUNC) should be set to “1”, and the bit PWME of timer1
mode register (TM1) should be set to “0”.
In addition, 16-bit Compare output mode is available, also.
13.4 8-bit Capture Mode
The Timer 0 capture mode is set by bit CAP0 of timer
mode register TM0 (bit CAP1 of timer mode register TM1
for Timer 1) as shown in Figure 13-6 .
As mentioned above, not only Timer 0 but Timer 1 can also
be used as a capture mode.
The Timer/Counter register is increased in response inter-
nal or external input. This counting function is same with
normal timer mode, and Timer interrupt is generated when
June. 2001 Ver 1.2
45