GMS87C1102 datasheet(53/89 Pages) HYNIX

53 / 89 page

GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

16.5 16-bit Capture Mode

16-bit capture mode is the same as 8-bit capture, except

that the Timer register is being run will 16 bits.

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.

Figure 16-9 16-bit Capture Mode

16.6 PWM Mode

The GMS81C1202 has a two high speed PWM (Pulse

Width Modulation) functions which shared with Timer1.

In PWM mode, pin RB4/COMP0/PWM0 outputs up to a

10-bit resolution PWM output. This pin should be defined

as a PWM output by setting "1" bit PWMO in RBFUNC

The period of the PWM output is determined by the

T1PPR (PWM0 Period Register) and PWM0HR[3:2]

(bit3,2 of PWM0 High Register) and the duty of the PWM

output is determined by the T1PDR (PWM0 Duty Regis-

ter) and PWM0HR[1:0] (bit1,0 of PWM0 High Register).

The user writes the lower 8-bit period value to the T1PPR

and the higher 2-bit period value to the PWM0HR[3:2].

An d writes d u t y v a lu e to th e T1 P D R an d th e

PWM0HR[1:0] same way.

The T1PDR is configured as a double buffering for glitch-

less PWM output. In Figure 16-10 , the duty data is trans-

fered from the master to the slave when the period data

matched to the counted value. ( i.e. at the beginning of next

duty cycle )

PWM Period = [ PWM0HR[3:2]T1PPR ] X Source Clock

PWM Duty = [ PWM0HR[1:0]T1PDR ] X Source Clock

The relation of frequency and resolution is in inverse pro-

portion. Table 16-2 shows the relation of PWM frequency

vs. resolution.

TM0

ADDRESS : D0H

RESET VALUE : --000000

CAP0

T0CK2

T0CK1

T0CK0

T0CN

T0ST

TM1

ADDRESS : D2H

RESET VALUE : 00000000

POL

16BIT

PWME

CAP1

T1CK1

T1CK0

T1CN

T1ST

XXX

÷ 2

÷ 4

÷ 128

÷ 512

÷ 8

÷ 32

fxin

EC0

Edge Detector

MUX

T0 + T1 ( 16-bit )

TDR1

T0IF

CLEAR

COMPARATOR

TIMER 0

INTERRUPT

T0ST

0 : Stop

1 : Start

T0CN

T0CK[2:0]

TDR0

INT0IF

INT 0

INTERRUPT

INT0

IEDS[1:0]

CAPTURE

CDR1

CDR0

( 8-bit ) ( 8-bit ) ( 8-bit ) ( 8-bit )

÷ 2048

X : The value "0" or "1" corresponding your operation.

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