COP8SEC5 datasheet(3/47 Pages) NSC

3 / 47 page

1.0 Device Description (Continued)

memory to the CPU. This instruction can be used for table

lookup and to read the entire program memory for checksum

calculations.

RETSK: (Return Skip); Single byte instruction allows return

from subroutine and skips next instruction. Decision to

branch can be made in the subroutine itself, saving code.

AUTOINC/DEC: (Auto-Increment/Auto-Decrement); These

instructions use the two memory pointers B and X to effi-

ciently process a block of data (analogous to “FOR NEXT” in

higher level languages).

1.2.3 Bit-Level Control

Bit-level control over many of the microcontroller’s I/O ports

provides a flexible means to ease layout concerns and save

board space. All members of the COP8 family provide the

ability to set, reset and test any individual bit in the data

memory address space, including memory-mapped I/O ports

and associated registers.

1.2.4 Register Set

Three memory-mapped pointers handle register indirect ad-

dressing and software stack pointer functions. The memory

data pointers allow the option of post-incrementing or post-

decrementing with the data movement instructions (LOAD/

EXCHANGE). And 15 memory-maped registers allow de-

signers to optimize the precise implementation of certain

specific instructions.

1.3 PACKAGING/PIN EFFICIENCY

Real estate and board configuration considerations demand

maximum space and pin efficiency, particularly given today’s

high integration and small product form factors. Microcontrol-

ler users try to avoid using large packages to get the I/O

needed. Large packages take valuable board space and in-

crease device cost, two trade-offs that microcontroller de-

signs can ill afford.

The COP8 family offers a wide range of packages and does

not waste pins: up to 90.9% (or 40 pins in the 44-pin pack-

age, these packages are not available on all COP8 devices)

are devoted to useful I/O.

Connection Diagrams

DS100973-6

Top View

Order Number COP8SEC516M

See NS Package Number M16B

DS100973-43

Top View

Order Number COP8SEC520M or COP8SER720M

See NS Package Number M20B

FIGURE 2. Connection Diagrams

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