MC80F0204 Datasheet, PDF(38/126 Page) List of Unclassifed Manufacturers

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MC80F0204 Datasheet, PDF (38/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0104/0204

Preliminary

Figure 9-2 R0 Port Register

In addition, Port R0 is multiplexed with various alternate

functions. The port selection register PSR0 (address 0F8H)

and PSR1 (address 0F9H) 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

â1â 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(00EFH), SI-

OM(00E2H) and ASIMR(00E6H) register to enable the

corresponding peripheral operation and select operation

mode.

Port Pin

R00

R01

R02

R03

R04

R05

R06

R07

Alternate Function

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)

9.2 R1 and R1IO register

R1 is a 5-bit CMOS bidirectional I/O port (address 0C2H).

Each I/O pin can independently used as an input or an out-

put through the R1IO register (address 0C3H). 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 0F8H)

and PSR1 (address 0F9H) control the selection of alternate

functions such as 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 se-

lected by writing â1â 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(00EFH) register to enable ADC and select channel

Port Pin

R10

R11

R12

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)

Mar. 2005 Ver 0.2

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