AT89LP216-20PI datasheet(7/90 Pages) ATMEL

7 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

The Atmel Signature Array is initialized with the Device ID in the factory. The User Signature

Array is available for user identification codes or constant parameter data. Data stored in the sig-

nature array is not secure. Security bits will disable writes to the array; however, reads are

always allowed.

6.2

Data Memory

The AT89LP216 contains 128 bytes of general SRAM data memory plus 128 bytes of I/O mem-

ory mapped into a single 8-bit address space. The 128 bytes of data memory may be accessed

through both direct and indirect addressing of the lower 128 byte addresses. The 128 bytes of

I/O memory reside in the upper 128-byte address space (Figure 6-2). The I/O memory can only

be accessed through direct addressing and contains the Special Function Registers (SFRs).

Indirect accesses to the upper 128-byte addresses will return invalid data. The lowest 32 bytes

of data memory are grouped into 4 banks of 8 registers each. The RS0 and RS1 bits (PSW.3

and PSW.4) select which register bank is in use. Instructions using register addressing will only

access the currently specified bank. The AT89LP216 does not support external data memory.

Figure 6-2.

Data Memory Map

Table 6-1.

AUXR1

– Auxiliary Register 1

AUXR1 = A2H

Reset Value = XXXX 0XXXB

Not Bit Addressable

––––

SIGEN

–––

Bit

76543

210

FFH

UPPER

128

80H

7F H

LO WER

128

Accessible

By Direct

Addressing

Only

Accessible

By Direct

and Indirect

Addressing

Only

Special Function

Registers

Ports

Status and Control Bits

Timers

Registers

Stack Pointer

Accumulator

(Etc.)

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