GMS81C50 Datasheet, PDF(38/99 Page) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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GMS81C50 Datasheet, PDF (38/99 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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HYUNDAI

GMS81C50 Series

R1 Data Register (R/W)

ADDRESS : 0C2H

RESET VALUE : Undefined

R17 R16 R15 R14 R13 R12 R11 R10

R1 Direction Register (W)

R1DD

ADDRESS : 0C3H

RESET VALUE : 00H

Port Direction

0: Input

1: Output

R1 Pull-up Selection Register (W)

R1PC

ADDRESS : 0F9H

RESET VALUE : 00H

Pull-up select

0: Without pull-up

1: With pull-up

R1 Open drain Assign Register (W)

ADDRESS : 0DEH

RESET VALUE : 00H

P1ODC

Open drain select

0: Push-pull

1: Open drain

R1 Port Mode Register (W)

PMR1

ADDRESS : 0C9H

RESET VALUE : 00H

Mode select

0: Port R1 selection

1: Function selection

(1) R1 I/O Data Direction Register (R1DD)

R1 I/O Data Direction Register (R1DD) is 8-bit register,

and can assign input state or output state to each bit. If

R1DD is ``1``, port R1 is in the output state, and if ``0``, it

is in the input state. R1DD is write-only register. Since

R1DD is initialized as ``00 h`` in reset state, the whole port

R1 becomes input state.

(2) R1 Data Register (R1)

R1 data register (R1) is 8-bit register to store data of port

R1. When set as the output state by R1DD, and data is writ-

ten in R1, data is outputted into R1 pin. When set as the in-

put state, input state of pin is read. The initial value of R1

is unknown in reset state.

(3) R1 Mode Register (PMR1)

R1 Port Mode Register (PMR1) is 8-bit register, and can

assign the selection mode for each bit. When set as ``0``,

corresponding bit of PMR1 acts as port R1 selection mode,

and when set as ``1``, it becomes function selection mode.

PMR1 is write-only register and initialized as ``00 h`` in

reset state. Therefore, becomes Port selection mode. Port

R1 can be I/O port by manipulating each R1DD bit, if cor-

responding PMR1 bit is selected as ``0``.

Pin Name

T0S

T1S

T2S

ECS

PMR1

Selection

Mode

R17 (I/O)

T0 (O)

R16 (I/O)

T1 (O)

R15 (I/O)

T2 (O)

R14 (I/O)

/EC (I)

Remarks

Timer0

Timer1

Timer2

Timer0 Event

INT2S

INT1S

R12 (I/O)

INT2 (I)

Timer0 Input

Capture

R11 (I/O)

INT1 (I)

Table 9-1 Selection mode of PMR1

(4) R1 Pull-up Resistor Control Register (R1PC)

R1 pull-up resistor control register (R1PC) is 8-bit register

and can control pull-up on or off each bit, if corresponding

port is selected as input. If R1PC is selected as ``1``, pull-

up ia disabled and if selected as ``0``, it is enabled. R1PC

is write-only register and initialized as ``00 h`` in reset

state. The pull-up is automatically disabled, if correspond-

ing port is selected as output.

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