MagnaChip MC80C0104, User Manual, Page: 38 / 126

MC80F0104/0204 Preliminary
34 Mar. 2005 Ver 0.2
Figure 9-2 R0 Port Register
In addition, Port R0 is multiplexed with various alternate
functions. The port selection register PSR0 (address 0F8
H
)
and PSR1 (address 0F9
H
) control the selection of alternate
functions such as external interrupt 3 (INT3), external in-
terrupt 2 (INT2), event counter input 0 (EC0), timer 0 out-
put (T0O), timer 2 output (T2O) and event counter input 1
(EC1). When the alternate function is selected by writing
“1” in the corresponding bit of PSR0 or PSR1, port pin can
be used as a corresponding alternate features regardless of
the direction register R0IO.
The ADC input channel 1~7 (AN1~AN7), SIO data input
(SI), SIO data output (SOUT) and UART data input
(RXD), UART data output (TXD) and UART clock input
(ACLK) can be selected by setting ADCM(00EF
H
), SI-
OM(00E2
H
) and ASIMR(00E6
H
) register to enable the
corresponding peripheral operation and select operation
mode.
9.2 R1 and R1IO register
R1 is a 5-bit CMOS bidirectional I/O port (address 0C2
H
).
Each I/O pin can independently used as an input or an out-
put through the R1IO register (address 0C3
H
). When R10
through R14 pins are used as input ports, an on-chip pull-
up resistor can be connected to them in 1-bit units with a
pull-up selection register 1 (PU1). Each I/O pin of R0 port
can be used to open drain output port by setting the corre-
sponding bit of the open drain selection register 1 (R1OD).
In addition, Port R1 is multiplexed with various alternate
functions. The port selection register PSR0 (address 0F8
H
)
and PSR1 (address 0F9
H
) control the selection of alternate
functions such as Analog reference voltage input (AV
REF
),
external interrupt 0 (INT0), external interrupt 1 (INT1),
PWM 1 output (PWM1O), PWM 3 output (PWM3O) and
buzzer output (BUZO). When the alternate function is se-
lected by writing “1” in the corresponding bit of PSR0 or
PSR1, port pin can be used as a corresponding alternate
features regardless of the direction register R1IO.
The ADC input channel 0 (AN0) can be selected by setting
ADCM(00EF
H
) register to enable ADC and select channel
0 .
Port Pin Alternate Function
R00
R01
R02
R03
R04
R05
R06
R07
INT3 (External interrupt 3)
SCK (SIO clock input/output)
AN1(ADC Input channel 1)
SI (SIO data input)
AN2 (ADC Input channel 2)
SOUT (SIO data output)
AN3 (ADC Input channel 3)
INT2 (External interrupt 2)
AN4 (ADC Input channel 4)
EC0 (Event counter input 0)
RXD (UART data input)
AN5 (ADC Input channel 5)
T0O (Timer output 0)
TXD (UART data output)
AN6 (ADC Input channel 6)
T2O (Timer output 2)
ACLK (UART clock input)
AN7 (ADC Input channel 7)
EC1 (Event counter input 1)
Port Pin Alternate Function
R10
R11
R12
AN0 (ADC input channel 0)
AV
REF
(Analog reference voltage)
PWM1O (PWM 1 output)
INT0 (External Interrupt 0)
PWM3O (PWM 3 output)
INT1 (External Interrupt 1)
BUZO (Buzzer output)