HMS81032TL datasheet(34/77 Pages) HYNIX

34 / 77 page

HMS81004E/08E/16E/24E/32E

JUNE 2001 Ver 1.00

(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 “00h” 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

written in R1, data is outputted into R1 pin. When set as

the input state, input state of pin is read. The initial value

of R1 is unknown in reset state.

(3) R1 Open drain Assign Register (R1ODC)

R1 Open Drain Assign Register (R1ODC) is 8bit register,

and can assign R1 port as open drain output port each bit,

if corresponding port is selected as output. If R1ODC is

selected as “1”, port R1 is open drain output, and if select-

ed as “0”, it is push-pull output. R1ODC is write-only reg-

ister and initialized as “00h” in reset state.

(4) R1 Port 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 “00h” in re-

set 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”.

(5) R1 Pull-up Control Register (R1PC)

R1 Pull-up 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 “00h” in reset state. The

R1 Data Register (R/W)

ADDRESS : 0C2H

RESET VALUE : Undefined

R17 R16 R15 R14 R13 R12 R11 R10

Port Direction

R1 Direction Register (W)

R1DD

ADDRESS : 0C3H

RESET VALUE : 00H

0: Input

1: Output

Pull-up select

R1 Pull-up Control Register (W)

R1PC

ADDRESS : 0F9H

RESET VALUE : 00H

1: Without pull-up

0: With pull-up

Open drain select

R1 Open drain Assign Register (W)

P1ODC

ADDRESS : 0DEH

RESET VALUE : 00H

0: Push-pull

1: Open drain

Mode select

R1 Port Mode Register (W)

PMR1

ADDRESS : 0C9H

RESET VALUE : 00H

0: Port R1 selection

1: Function selection

Pin Name

PMR1

Selection

Mode

Remarks

T0S

R17 (I/O)

T0 (O)

Timer0

T1S

R16 (I/O)

T1 (O)

Timer1

T2S

R15 (I/O)

T2 (O)

Timer2

ECS

R14 (I/O)

1EC (I)

Timer0 Event

INT2S

R12 (I/O)

INT2 (I)

Timer0 Input Cap-

ture

INT1S

R11 (I/O)

INT1 (I)

Table 9-1 Selection mode of PMR1

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