COP820C datasheet(18/26 Pages) NSC

18 / 26 page

Memory Map

All RAM, ports and registers (except A and PC) are mapped

into data memory address space.

Address

Contents

COP820C Family

00 to 2F

On Chip RAM Bytes

30 to 7F

Unused RAM Address Space (Reads as all

Ones)

COP840C Family

00 to 6F

On Chip RAM Bytes

70 to 7F

Unused RAM Address Space (Reads as all

Ones)

COP820C and COP840C Families

80 to BF

Expansion Space for on Chip EERAM

C0 to CF

Expansion Space for I/O and Registers

D0 to DF

On Chip I/O and Registers

Port L Data Register

Port L Configuration Register

Port L Input Pins (Read Only)

Reserved for Port L

Port G Data Register

Port G Configuration Register

Port G Input Pins (Read Only)

Address

Contents

COP820C and COP840C Families

Port I Input Pins (Read Only)

D8–DB

Reserved for Port C

Port D Data Register

DD–DF

Reserved for Port D

E0 to EF

On Chip Functions and Registers

E0–E7

Reserved for Future Parts

Reserved

MICROWIRE/PLUS Shift Register

Timer Lower Byte

Timer Upper Byte

Timer Autoload Register Lower Byte

Timer Autoload Register Upper Byte

CNTRL Control Register

PSW Register

F0 to FF

On Chip RAM Mapped as Registers

X Register

SP Register

B Register

Reading unused memory locations below 7FH will return all

ones. Reading other unused memory locations will return

undefined data.

Instruction Set

Registers

8-bit Accumulator register

8-bit Address register

8-bit Stack pointer register

15-bit Program counter register

upper 7 bits of PC

lower 8 bits of PC

1-bit of PSW register for carry

Half Carry

GIE 1-bit of PSW register for global interrupt enable

Symbols

[B]

Memory indirectly addressed by B register

[X]

Memory indirectly addressed by X register

Mem

Direct address memory or [B]

MemI Direct address memory or [B] or Immediate data

Imm

8-bit Immediate data

Reg

and SP)

Bit

Bit number (0 to 7)

←

Loaded with

↔

Exchanged with

Instruction Set

ADD

add

A ← A + MemI

ADC

add with carry

A ← A+MemI+C,C ← Carry

HC ← Half Carry

SUBC

subtract with carry

A ← A + MemI +C, C ← Carry

HC ← Half Carry

AND

Logical AND

A ← A and MemI

Logical OR

A ← A or MemI

XOR

Logical Exclusive-OR

A ← A xor MemI

IFEQ

IF equal

Compare A and MemI, Do next if A = MemI

IFGT

IF greater than

Compare A and MemI, Do next if A > MemI

IFBNE

IF B not equal

Do next if lower 4 bits of B

≠ Imm

DRSZ

Decrement Reg. ,skip if zero

Reg ← Reg − 1, skip if Reg goes to 0

COP820C Datasheet(PDF) 18 Page - National Semiconductor (TI)

COP820C Datasheet(HTML) 18 Page - National Semiconductor (TI)

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