R1 And R1Io Register - Abov MC80F0304 User Manual

counter input 0 (EC0), timer 0 output (T0O), timer 2 output
(T2O) and event counter input 1 (EC1). When the alternate func-
tion is selected by writing "1" in the corresponding bit of PSR0
or PSR1, port pin can be used as a corresponding alternate fea-
tures 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 select-
e d b y s e t t i n g A D C M ( 0 0 E F
ASIMR(00E6 ) register to enable the corresponding peripheral
H
operation and select operation mode.

9.2 R1 and R1IO register

R1 is a 5-bit CMOS bidirectional I/O port (address 0C2
I/O pin can independently used as an input or an output through
the R1IO register (address 0C3
are used as input ports, an on-chip pull-up resistor can be connect-
ed to them in 1-bit units with a pull-up selection register 1 (PU1).
Each I/O pin of R1 port can be used to open drain output port by
setting the corresponding bit of the open drain selection register
1 (R1OD).
In addition, Port R1 is multiplexed with various alternate func-
tions. The port selection register PSR0 (address 0F8
(address 0F9 ) control the selection of alternate functions such as
H
Analog reference voltage input (AVREF), 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 selected by writing "1" in the corresponding
bit of PSR0 or PSR1, port pin can be used as a corresponding al-
ternate features regardless of the direction register R1IO.
The ADC input channel 0 (AN0) and channel 8(AN8) can be se-
lected by setting ADCM(00EF
November 4, 2011 Ver 2.12
) , S I O M ( 0 0 E 2
H H
H
). When R10 through R17 pins
H
) and PSR1
H
) register to enable ADC and se-
H
Port Pin
R00-
R01
R02
) a n d
R03
R04
R05
R06
R07
). Each lect channel 0 and channel 8 .
Port Pin
R10
R11
R12
R13
R14
R15
R16
R17
MC80F0304/08/16
Alternate Function
INT3 (External interrupt 3)
SCK (SIO clock input/output)
AN1(ADC Input channel 1)
SI (SIO data input)I
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)
Alternate Function
AN0 (ADC input channel 0)
AVREF (Analog reference voltage)
PWM1O (PWM 1 output)
INT0 (External Interrupt 0)
PWM3O (PWM 3 output)
INT1 (External Interrupt 1)
BUZO (Buzzer output)
-
-
-
-
AN8
47