GMS81C2020 Datasheet, PDF (57/92 Pages) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

Hyundai Micro Electronics
GMS81C2020/GMS81C2120
15.5 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.
TM0
ADDRESS : D0H
-
-
CAP0 T0CK2 T0CK1 T0CK0 T0CN T0ST
RESET VALUE : --000000
-
-
1
X
X
X
X
X
TM1
POL
16BIT PWM1E CAP1 T1CK1 T1CK0 T1CN
T1ST
ADDRESS : D2H
RESET VALUE : 00000000
X
1
0
X
T0CK[2:0]
Edge Detector
T1CK[1:0]
T0CN
1
11
EC0
÷2
MUX
÷4
XX
÷8
÷1
fXI
÷ 32
fXI
÷2
÷ 128
÷8
÷ 512
CAPTURE
÷ 2048
INT0
1
1
X
X
X : The value "0" or "1" corresponding your operation.
T0ST
0 : Stop
1 : Clear and Start
T0 + T1 ( 16-bit )
CLEAR
COMPARATOR
T0IF
CDR1 CDR0 TDR1 TDR0
( 8-bit ) ( 8-bit ) ( 8-bit ) ( 8-bit )
INT0IF
TIMER 0
INTERRUPT
INT 0
INTERRUPT
IEDS[1:0]
Figure 15-9 16-bit Capture Mode
15.6 PWM Mode
The GMS81C2020 and GMS81C2120 has a high speed
PWM (Pulse Width Modulation) functions which shared
with Timer1.
In PWM mode, pin R56/PWM1O/T1O outputs up to a 10-
bit resolution PWM output. This pin should be configured
as a PWM output by setting "1" bit PWM1O in
R5FUNC.6 register.
The period of the PWM output is determined by the
T1PPR (PWM1 Period Register) and PWM1HR[3:2]
(bit3,2 of PWM1 High Register) and the duty of the PWM
output is determined by the T1PDR (PWM1 Duty Regis-
ter) and PWM1HR[1:0] (bit1,0 of PWM1 High Register).
The user writes the lower 8-bit period value to the T1PPR
and the higher 2-bit period value to the PWM1HR[3:2].
And writes duty value to the T1PDR and the
PWM1HR[1:0] same way.
The T1PDR is configured as a double buffering for glitch-
less PWM output. In Figure 15-10 , 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 = [ PWM1HR[3:2]T1PPR ] X Source Clock
PWM Duty = [ PWM1HR[1:0]T1PDR ] X Source Clock
The relation of frequency and resolution is in inverse pro-
portion. Table 15-2 shows the relation of PWM frequency
vs. resolution.
Nov. 1999 Ver 0.0
preliminary
57