GMS81C2020/GMS81C2120
Hyundai Micro Electronics
15.2 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 0000H until it
matches TDR0, TDR1 and then resets to 0000H. 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 T0CK0.
In 16-bit mode, the bits T1CK1,T1CK0 and 16BIT of TM1
should be set to "1" respectively.
ADDRESS : D0H
RESET VALUE : --000000
-
-
CAP0
0
T0CK2
X
T0CK1
X
T0CK0
X
T0CN
X
T0ST
X
TM0
TM1
-
-
ADDRESS : D2H
RESET VALUE : 00000000
POL
X
16BIT
1
PWM1E
0
CAP1
0
T1CK1
T1CK0
T1CN
X
T1ST
X
1
1
X : The value "0" or "1" corresponding your operation.
T1CK[1:0]
T0CK[2:0]
Edge Detector
T0ST
T0CN
0 : Stop
1 : Clear and Start
1
11
F/F
EC0
T1 ( 8-bit )
T0 ( 8-bit )
CLEAR
MUX
2
÷
÷
÷
÷
÷
÷
÷
XX
R40/T0O
4
R4FUNC.0
8
1
÷
÷
÷
T0IF
TIMER 0
INTERRUPT
32
128
512
2048
fXI
fXI
COMPARATOR
2
8
TDR1 ( 8-bit )
TDR0 ( 8-bit )
Figure 15-5 16-bit Timer / Counter Mode
15.3 8-bit Compare Output ( 16-bit )
The GMS81C2020 and GMS81C2120 has a function of
Timer Compare Output. To pulse out, the timer match can
goes to port pin(T0O, T1O) as shown in Figure 15-2 and
Figure 15-5 . Thus, pulse out is generated by the timer
match. These operation is implemented to pin, T0O,
PWM1O/T1O.
wave, and output frequency is same as below equation.
ꢀꢁꢂꢃꢄꢄꢅꢆꢃꢇꢈꢉꢊꢋꢌꢍꢎꢌꢈꢂꢏ
------------------------------------------------------------------------------------------
=
ꢀ
ꢐ × ꢑꢋꢌꢁꢂꢅꢄꢌꢋꢉꢒꢅꢄꢎꢌ × (ꢁꢂꢃ + ꢓ)
In this mode, the bit PWM1O/T1O of R5 function register
(R5FUNC.6) should be set to "1", and the bit PWM1E of
timer1 mode register ( TM1 ) should be set to "0".
This pin output the signal having a 50 : 50 duty square
In addition, 16-bit Compare output mode is available, also.
15.4 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 15-6 .
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
As mentioned above, not only Timer 0 but Timer 1 can also
54
preliminary
Nov. 1999 Ver 0.0
HYNIX [ HYNIX SEMICONDUCTOR ]
