AT89LP213-20PI datasheet(8/90 Pages) ATMEL

8 / 90 page

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

A map of the AT89LP213/214 program memory is shown in Figure 6-1. In addition to the 2K

code space from 0000h to 07FFh, the AT89LP213/214 also supports a 64-byte User Signature

Array and a 32-byte Atmel Signature Array that are accessible by the CPU in a read-only fash-

ion. In order to read from the signature arrays, the SIGEN bit in AUXR1 must be set. While

SIGEN is one, MOVC A,@A+DPTR will access the signature arrays. The User Signature Array

is mapped to addresses 0040h to 007Fh and the Atmel Signature Array is mapped to addresses

0000h to 001Fh. SIGEN must be cleared before using MOVC to access the code memory.

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 AT89LP213/214 contains 128 bytes of general SRAM data memory plus 128 bytes of I/O

memory 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 AT89LP213/214 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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