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DP80390

Pipelined High Performance 8-bit Microcontroller

Digital Core Design 

PIN

TYPE

DESCRIPTION

ready

input External memory data ready

ramdatai[7:0]

input Data bus from internal data memory

sfrdatai[7:0]

input Data bus from user SFR’s

int0

input External interrupt 0

int1

input External interrupt 1

t0

input Timer 0 input

t1

input Timer 1 input

gate0

input Timer 0 gate input

gate1

input Timer 1 gate input

rxdi

input Serial receiver input

tdi

input DoCD™ TAP data input

tck

input DoCD™ TAP clock input

tms

input DoCD™ TAP mode select input

rsto

output Reset output

port0o[7:0]

output Port 0 output

port1o[7:0]

output Port 1 output

port2o[7:0]

output Port 2 output

port3o[7:0]

output Port 3 output

prgaddr[15:0] output Internal program memory address bus

prgdatao[7:0] output Data bus for internal program memory

prgramwr

output Internal program memory write

sxdmaddr[15:0] output Sync XDATA memory address bus

(SXDM)

sxdmdatao[7:0] output Data bus for Sync XDATA memory

(SXDM)

sxdmoe

output Sync XDATA memory read (SXDM)

sxdmwe

output Sync XDATA memory write (SXDM)

xaddr[23:0]

output Address bus for external memories

xdatao[7:0]

output Data bus for external memories

xdataz

output Turn xdata bus into ‘Z’ state

xprgrd

output External program memory read

xprgwr

output External program memory write

xdatard

output External data memory read

xdatawr

output External data memory write

ramaddr[7:0] output Internal Data Memory address bus

ramdatao[7:0] output Data bus for internal data memory

ramoe

output Internal data memory output enable

ramwe

output Internal data memory write enable

sfraddr[6:0]

output Address bus for user SFR’s

sfrdatao[7:0]

output Data bus for user SFR’s

sfroe

output User SFR’s read enable

sfrwe

output User SFR’s write enable

tdo

output DoCD™ TAP data output

rtck

output DoCD™ return clock line

debugacs

output DoCD™ accessing data

coderun

output CPU is executing an instruction

pmm

output Power management mode indicator

stop

output Stop mode indicator

rxdo

output Serial receiver output

txd

output Serial transmitter output

All trademarks mentioned in this document

are trademarks of their respective owners.

UNITS SUMMARY

ALU – Arithmetic Logic Unit performs the

arithmetic and logic operations during execu-

tion of an instruction. It contains accumulator

(ACC), Program Status Word (PSW), (B) regis-

ters and related logic such as arithmetic unit,

logic unit, multiplier and divider.

Opcode Decoder – Performs an instruction

opcode decoding and the control functions for

all other blocks.

Control Unit – Performs the core synchroniza-

tion and data flow control. This module is di-

rectly connected to Opcode Decoder and

manages execution of all microcontroller tasks.

Program Memory Interface – Contains Pro-

gram Counter (PC) and related logic. It per-

forms the instructions code fetching. Program

Memory can be also written. This feature al-

lows usage of a small boot loader loading new

program into RAM, EPROM or FLASH

EEPROM storage via UART, SPI, I2C or

DoCD™ module.

External Memory Interface - Contains mem-

ory access related registers such as Data

Page High (DPH), Data Page Low (DPL) and

Data Pointer eXtended (DPX) registers. It per-

forms the external Program and Data Memory

addressing and data transfers. Program fetch

cycle length can be programmed by user. This

feature is called Program Memory Wait States,

and allows core to work with different speed

program memories.

Synchronous eXternal Data Memory

(SXDM) Interface – contains XDATA memory

access related logic allowing fast access to

synchronous memory devices. It performs the

external Data Memory addressing and data

transfers. This memory can be used to store

large variables frequently accessed by CPU,

improving overall performance of application.

Internal Data Memory Interface – Internal

Data Memory interface controls access into the

internal 256 bytes memory. It contains 8-bit

Stack Pointer (SP) register and related logic.

User SFRs Interface – Special Function Reg-

isters interface controls access to the special

registers. It contains standard and used de-

fined registers and related logic. User defined

external devices can be quickly accessed

(read, written, modified) using all direct ad-

dressing mode instructions.

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Copyright 1999-2007 DCD – Digital Core Design. All Rights Reserved.

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