GMS87C1102 datasheet(47/89 Pages) HYNIX

47 / 89 page

GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

16. TIMER / COUNTER

The GMS81C1202 has two 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 can be used either the two 8-bit Tim-

er/Counter or one 16-bit Timer/Counter by combining

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 2 and

most clock consists of 2048 oscillator periods, the count

rate is 1/2 to 1/2048 of the oscillator frequency in Timer0.

And Timer1 can use the same clock source too. In addition,

Timer1 has more fast clock source ( 1/1 to 1/8 ).

In the "counter" function, the register is increased in re-

sponse to a 0-to-1 (rising edge) transition at its correspond-

ing external input pin, EC0.

And in the "capture" function, the register is increased in

response external interrupt same with timer function.

When external interrupt edge input, the count register is

captured into capture data register CDRx.

Timer1 is shared with "PWM" function and "Compare out-

put" function

It has seven operating modes: "8-bit timer/counter", "16-

bit timer/counter", "8-bit capture", "16-bit capture", "8-bit

compare output", "16-bit compare output" and "10-bit

PWM" which are selected by bit in Timer mode register

TM0 and TM1 as shown in Figure 16-1 and Table 16-1.

Figure 16-1 Timer 0 and Timer 1 Mode Register

Timer 0 Mode Register

TM0

ADDRESS : D0H

RESET VALUE : --000000

CAP0

T0CK2

T0CK1

T0CK0

T0CN

T0ST

Timer 1 Mode Register

TM1

ADDRESS : D2H

RESET VALUE : 00000000

POL

16BIT

PWME

CAP1

T1CK1

T1CK0

T1CN

T1ST

CAP0

Capture mode selection bit.

0 : Disables Capture

1 : Enables Capture

T0CN

Continue control bit

0 : Stop counting

1 : Start counting continuously

T0CK[2:0]

Input clock selection

000 : fxin

÷ 2

100 : fxin

÷ 128

001 : fxin

÷ 4

101 : fxin

÷ 512

010 : fxin

÷ 8

110 : fxin

÷ 2048

011 : fxin

÷ 32

111 : External Event ( EC0 )

T0ST

Start control bit

0 : Stop counting

1 : Start countingn

POL

PWM Output Polarity

0 : Duty active low

1 : Duty active high

T1CK[2:0]

Input clock selection

00 : fxin

10 : fxin

÷ 8

01 : fxin

÷ 2

11 : using the Timer 0 clock

16BIT

16-bit mode selection

0 : 8-bit mode

1 : 16-bit mode

T1CN

Continue control bit

0 : Stop counting

1 : Start counting continuously

PWME

PWM enable bit

0 : Disables PWM

1 : Enables PWM

T1ST

Start control bit

0 : Stop counting

1 : Start countingn

CAP1

Capture mode selection bit.

0 : Disables Capture

1 : Enables Capture

GMS87C1102 Datasheet(PDF) 47 Page - Hynix Semiconductor

GMS87C1102 Datasheet(HTML) 47 Page - Hynix Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

Datasheet Download

Link URL