DS87C530 datasheet(2/40 Pages) DALLAS

2 / 40 page

DS87C530

022197 2/40

A combination of high performance microcontroller

core, real time clock, battery backed SRAM, and power

management makes the DS87C530 ideal for instru-

ments and portable applications. It also provides sev-

eral peripherals found on other Dallas High–Speed

Microcontrollers. These include two independent serial

ports, two data pointers, on–chip power monitor with

brown–out detection and a watchdog timer.

Power Management Mode (PMM) allows software to

select a slower CPU clock. While default operation uses

four clocks per machine cycle, the PMM runs the pro-

cessor at 64 or 1024 clocks per cycle. There is a corre-

sponding drop in power consumption when the proces-

sor slows.

Note: The DS87C530 is a monolithic device. A user

must supply an external battery or super–cap and a

32.768 KHz timekeeping crystal to have permanently

powered

timekeeping

nonvolatile

RAM.

The

DS87C530 provides all the support and switching cir-

cuitry needed to manage these resources.

ORDERING INFORMATION

PART NUMBER

PACKAGE

MAX. CLOCK SPEED

TEMPERATURE RANGE

DS87C530–QCL

52–pin PLCC

33 MHz

°C to 70°C

DS87C530–QNL

52–pin PLCC

33 MHz

–40

°C to +85°C

DS87C530–KCL

52–pin windowed CERQUAD

33 MHz

°C to 70°C

DS87C530–ECL

52–PIN TQFP

33 MHz

°C to 70°C

DS87C530–ENL

52–PIN TQFP

33 MHz

–40

°C to +85°C

DS87C530 BLOCK DIAGRAM Figure 1

INTERRUPT

CLOCKS AND

LOGIC

MEMORY CONTROL

INTERRUPT REG.

INSTRUCTION

DECODE

PSW

STACK POINTER

ALU REG. 2

B REGISTER

ACCUMULATOR

ALU REG. 1

ALU

VCC POWER MONITOR

OSCILLATOR

WATCHDOG TIMER

POWER CONTROL REG.

WATCHDOG REG.

RESET

CONTROL

256 BYTES

SFR 8 RAM

DPTR1

PC ADDR. REG.

BUFFER

PC INCREMENT

PROG. COUNTER

DPTR0

ADDRESS BUS

16K X 8

OTP

ROM

1K X 8

SRAM

REAL TIME

BATTERY

CONTROL

CLOCK

VCC

VBAT

RTCX1 RTCX2

GND

VCC2

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