IS80C51-24PQI datasheet(9/43 Pages) ISSI

Part #	IS80C51-24PQI

Description	CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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IS80C51

IS80C31

Integrated Silicon Solution, Inc. — 1-800-379-4774

9

MC003-1D

11/19/98

ISSI®

SPECIAL FUNCTION REGISTERS

(Continued)

Stack Pointer (SP)

The Stack Pointer Register is eight bits wide. It is

incremented before data is stored during PUSH and CALL

executions. While the stack may reside anywhere in on-

chip RAM, the Stack Pointer is initialized to 07H after a

reset. This causes the stack to begin at location 08H.

Data Pointer (DPTR)

The Data Pointer consists of a high byte (DPH) and a low

byte (DPL). Its function is to hold a 16-bit address. It may

be manipulated as a 16-bit register or as two independent

8-bit registers.

Ports 0 To 3

P0, P1, P2, and P3 are the SFR latches of Ports 0, 1, 2, and

3, respectively.

Serial Data Buffer (SBUF)

The Serial Data Buffer is actually two separate registers,

a transmit buffer and a receive buffer register. When data

is moved to SBUF, it goes to the transmit buffer, where it

is held for serial transmission. (Moving a byte to SBUF

initiates the transmission.) When data is moved from

SBUF, it comes from the receive buffer.

Timer Registers

Register pairs (TH0, TL0) and (TH1, TL1) are the 16-bit

Counter registers for Timer/Counters 0 and 1, respectively.

Control Registers

Special Function Registers IP, IE, TMOD, TCON, SCON,

and PCON contain control and status bits for the interrupt

system, the Timer/Counters, and the serial port. They are

described in later sections of this chapter.

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IS80C51-24PQI Datasheet(PDF) 9 Page - Integrated Silicon Solution, Inc

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