AT89C51ED2-RDTUM datasheet(5/137 Pages) ATMEL

5 / 137 page

4235K–8051–05/08

AT89C51RD2/ED2

Table 3-3.

Interrupt SFRs

Mnemonic

Add

Name

IEN0

A8h

Interrupt Enable Control 0

ET2

ET1

EX1

ET0

EX0

IEN1

B1h

Interrupt Enable Control 1

ESPI

KBD

IPH0

B7h

Interrupt Priority Control High 0

PPCH

PT2H

PHS

PT1H

PX1H

PT0H

PX0H

IPL0

B8h

Interrupt Priority Control Low 0

PPCL

PT2L

PLS

PT1L

PX1L

PT0L

PX0L

IPH1

B3h

Interrupt Priority Control High 1

SPIH

KBDH

IPL1

B2h

Interrupt Priority Control Low 1

SPIL

KBDL

Table 3-4.

Port SFRs

Mnemonic

Add

Name

80h

8-bit Port 0

90h

8-bit Port 1

A0h

8-bit Port 2

B0h

8-bit Port 3

C0h

8-bit Port 4

E8h

8-bit Port 5

C7h

8-bit Port 5 (byte addressable)

Table 3-5.

Timer SFRs

Mnemonic

Add

Name

TCON

88h

Timer/Counter 0 and 1 Control

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

TMOD

89h

Timer/Counter 0 and 1 Modes

GATE1

C/T1#

M11

M01

GATE0

C/T0#

M10

M00

TL0

8Ah

Timer/Counter 0 Low Byte

TH0

8Ch

Timer/Counter 0 High Byte

TL1

8Bh

Timer/Counter 1 Low Byte

TH1

8Dh

Timer/Counter 1 High Byte

WDTRST

A6h

WatchDog Timer Reset

WDTPRG

A7h

WatchDog Timer Program

WTO2

WTO1

WTO0

T2CON

C8h

Timer/Counter 2 control

TF2

EXF2

RCLK

TCLK

EXEN2

TR2

C/T2#

CP/RL2#

T2MOD

C9h

Timer/Counter 2 Mode

T2OE

DCEN

RCAP2H

CBh

Timer/Counter 2 Reload/Capture

High Byte

RCAP2L

CAh

Timer/Counter 2 Reload/Capture

Low Byte

TH2

CDh

Timer/Counter 2 High Byte

AT89C51ED2-RDTUM Datasheet(PDF) 5 Page - ATMEL Corporation

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