DS89C430 datasheet(16/48 Pages) DALLAS

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DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers

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All standard SFR locations from the 8051 are duplicated in the DS89C430, and several SFRs have been added for

the unique features of the DS89C430. Most of these features are controlled by bits in SFRs located in unused

locations in the 8051 SFR map, allowing for increased functionality while maintaining complete instruction set

compatibility. Table 1 shows the SFRs and their locations. Table 2 specifies the default reset condition for all SFR

bits.

Data Pointers

The data pointers (DPTR and DPTR1) are used to assign a memory address for the MOVX instructions. This

address can point to a MOVX RAM location (on-chip or off-chip) or a memory-mapped peripheral. Two pointers are

useful when moving data from one memory area to another, or when using a memory-mapped peripheral for both

source and destination addresses. The user can select the active pointer through a dedicated SFR bit (SEL =

DPS.0), or can activate an automatic toggling feature for altering the pointer selection (TSL = DPS.5). An additional

feature, if selected, provides automatic incrementing or decrementing of the current DPTR.

Stack Pointer

The stack pointer denotes the register location at the top of the stack, which is the last used value. The user can

place the stack anywhere in the scratchpad RAM by setting the stack pointer to the desired location, although the

lower bytes are normally used for working registers.

I/O Ports

The DS89C430 offers four 8-bit I/O ports. Each I/O port is represented by an SFR location and can be written or

read. The I/O port has a latch that contains the value written by software.

Counter/Timers

Three 16-bit timer/counters are available in the DS89C430. Each timer is contained in two SFR locations that can

be read or written by software. The timers are controlled by other SFRs, described in the SFR Bit Description

section of the Ultra-High-Speed Flash Microcontroller User’s Guide.

Serial Ports

The DS89C430 provides two UARTs that are controlled and accessed by SFRs. Each UART has an address that

is used to read and write the value contained in the UART. The same address is used for both read and write

operations, and the read and write operations are distinguished by the instruction. Its own SFR control register

controls each UART.

Table 1. SFR Register Map

ADDRESS

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

80h

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

81h

DPL

82h

DPH

83h

DPL1

84h

DPH1

85h

DPS

86h

ID1

ID0

TSL

AID

—

SEL

PCON

87h

SMOD_0

SMOD0

OFDF

OFDE

GF1

GF0

STOP

IDLE

TCON

88h

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

TMOD

89h

GATE

TL0

8Ah

TL1

8Bh

TH0

8Ch

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