GMS82524TK View Datasheet(PDF) - Hynix Semiconductor
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GMS82524TK Datasheet PDF : 93 Pages
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HYUNDAI MicroElectronics
GMS82512/16/24
11. TIMER/EVENT COUNTER
The GMS825xx has four Timer/Counter registers. Each
module can generate an interrupt to indicate that an event
has occurred (i.e. timer match).
Timer 0 and Timer 1 are can be used either two 8-bit Tim-
er/Counter or one 16-bit Timer/Counter with combine
them. And Timer 2 and Timer 3 are can be used either two
8-bit Timer or one 16-bit Timer with combine them.
In the “timer” function, the register is increased every in-
ternal clock input. Thus, one can think of it as counting in-
ternal clock input. Since a least clock consists of 4 and
most clock consists of 64 oscillator periods, the count rate
is 1/4 to 1/64 of the oscillator frequency.
In the “counter” function, the register is incremented in re-
sponse to a 1-to-0 (falling edge) transition at its corre-
sponding external input pin, EC0 .
In addition the “capture” function, the register is incre-
mented in response external or internal clock sources same
with timer or counter function. When external clock edge
input, the count register is captured into Timer data register
correspondingly.
It has four operating modes: “8-bit timer/counter”, “16-bit
timer/counter”, “8-bit capture”, “16-bit capture” which are
selected by bit in Timer mode register TM0 and TM2 as
shown in Table 11-1.
In operation of Timer 2, Timer 3, their operations are same
with Timer 0, Timer 1, respectively as shown in Table 11-
2.
TM0
CAP
0
T1ST
T1SL
[1:0]
T0ST
T0CN
0
X
X
X
0
X 01 or X
X
10 or
1
X
11
X
X
1
X
X
X
0
X
X
X
0
X
X
X
00
1
X
X
X
1
X
X
X
T0SL[1:0]
TIMER 0
TIMER 1
01 or 10 or 11
00
01 or 10 or 11
00
01 or 10 or 11
00
01 or 10 or 11
00
8-bit Timer
8-bit Timer
8-bit Event counter
8-bit Timer
8-bit Capture (internal clock) 8-bit Timer
8-bit Capture (external clock) 8-bit Timer
16-bit Timer
16-bit Event counter
16-bit Capture (internal clock)
16-bit Capture (external clock)
Table 11-1 TM0 Timer Mode Register
TM2
CAP
2
T3ST
T3SL
[1:0]
T2ST
T2CN
0
X
X
X
0
X 01 or X
X
10 or
1
X
11
X
X
1
X
X
X
0
X
X
X
0
X
X
X
00
1
X
X
X
1
X
X
X
T2SL[1:0]
01 or 10 or 11
00
01 or 10 or 11
00
01 or 10 or 11
00
01 or 10 or 11
00
TIMER 2
TIMER 3
8-bit Timer
8-bit Timer
reserved
8-bit Timer
8-bit Capture (internal clock) 8-bit Timer
8-bit Capture (external clock) 8-bit Timer
16-bit Timer
16-bit Event counter
16-bit Capture (internal clock)
16-bit Capture (external clock)
Table 11-2 TM2 Timer Mode Register
FEB. 2000 Ver 1.00
33
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