Rainbow-electronics W78C52D Manual de usuario descargar pdf (Pagina 4)

Preliminary W78C52D

- 4 -

PSEN

Program Store Enable Output, active low. PSEN enables the external ROM onto the Port 0

address/data bus during fetch and MOVC operations.

PSEN

goes to a high impedance state during

reset with a weak pull-up.

XTAL1

Crystal 1. This is the crystal oscillator input. This pin may be driven by an external clock.

XTAL2

Crystal 2. This is the crystal oscillator output. It is the inversion of XTAL1.

VSS, VDD

Power Supplies. These are the chip ground and positive supplies.

BLOCK DIAGRAM

P3.0

P3.7

P1.0

P1.7

ALU

Port 0

Latch

Port 1

Latch

Timer

Port

UART

XTAL1 PSENALE GNDVDDRSTXTAL2

Oscillator

Interrupt

PSW

Instruction

Decoder

Sequencer

Reset Block

Bus & Clock

Controller

SFR RAM

Address

Power control

256 bytes

RAM & SFR

Stack

Pointer

Addr. Reg.

Incrementor

DPTR

Temp Reg.

T2T1

ACC

Port 3

Latch

Port 4

Latch

Port

Port 2

Latch

P4.0

P4.3

Port

P2.0

P2.7

P0.0

P0.7

INT2

INT3

Watchdog

Timer

8K bytes

ROM

1 2 3 4 5 6 7 8 9 ... 17 18

Preliminary W78C52D 1
8-BIT MICROCONTROLLER 1

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Rainbow-electronics W78C52D Manual de usuario Pagina 4

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