GMS81C5108
12.4 16-bit Capture Mode
16-bit capture mode is the same as 8-bit capture, except
that the Timer register is running with 16 bits.
In 16-bit mode, the bits T1CK1,T1CK0 and 16BIT of TM1
should be set to “1” respectively.
The clock source of the Timer 0 is selected either internal
or external clock by bit T0CK2, T0CK1 and T0CK0.
ADDRESS : 0E0H
RESET VALUE : --000000
-
-
CAP0
1
T0CK2
X
T0CK1
X
T0CK0
X
T0CN
X
T0ST
X
TM0
TM1
B
ADDRESS : 0E2H
RESET VALUE : 00000000
POL
X
16BIT
1
PWME
0
CAP1
X
T1CK1
1
T1CK0
1
T1CN
X
T1ST
X
B
X : The value “0” or “1” corresponding your operation.
T0CK[2:0]
T0ST
0 : Stop
1 : Clear and Start
Edge Detector
EC0
1
CLEAR
T0 + T1 (16-bit)
MUX
÷ 2
÷ 4
÷ 8
T0CN
TIMER 0
INTERRUPT
T0IF
X
0X
1X
IN
÷ 32
÷ 128
÷ 512
÷ 1024
COMPARATOR
TDR0
SX
IN
CAPTURE
CDR1
(8-bit)
TDR1
(8-bit)
CDR0
(8-bit)
2
(8-bit)
SCMR[1:0]
INT 0
INTERRUPT
INT0
INT0IF
IESR[1:0]
Figure 12-10 16-bit Capture Mode
12.5 8-Bit (16-Bit) Compare OutPut Mode
The GMS81C5108 has a function of Timer Compare Out-
put. To pulse out, the timer match can goes to port pin
(R31) as shown in Figure 12-3 and Figure 12-6. Thus,
pulse out is generated by the timer match. These operation
is implemented to pin, R31/PWM.
In addition, 16-bit Compare output mode is available, also.
This pin output the signal having a 50 : 50 duty square
wave, and output frequency is same as below equation.
Oscillation Frequency
fCOMP = --------------------------------------------------------------------------------------
In this mode, the bit PWMO of Port Mode Register (PMR)
should be set to “1”, and the bit PWME of Timer1 Mode
Register (TM1) should be cleared to “0”.
2 × Prescaler Value × (TDR + 1)
12.6 PWM Mode
The GMS81C5108 has one high speed PWM (Pulse Width
Modulation) function which shared with Timer1.
of PWM High Register) and the duty of the PWM output
is determined by the T1PDR (PWM Duty Register) and
PWMHR[1:0] (bit1,0 of PWM High Register).
In PWM mode, the R31/PWM pin operates as a 10-bit res-
olution PWM output port. For this mode, the bit PWM of
Port Mode Register (PMR) and the bit PWME of timer1
mode register (TM1) should be set to “1” respectively.
The user can use PWM data by writing the lower 8-bit pe-
riod value to the T1PPR and the higher 2-bit period value
to the PWMHR[3:2]. And the duty value can be used with
the T1PDR and the PWMHR[1:0] in the same way.
The period of the PWM output is determined by the
T1PPR (PWM Period Register) and PWMHR[3:2] (bit3,2
The T1PDR is configured as a double buffering for glitch-
JUNE 2001 Ver 1.0
53
HYNIX [ HYNIX SEMICONDUCTOR ]
