AT89LP213 datasheet(67/98 Pages) ATMEL

67 / 98 page

3538D–MICRO–10/09

AT89LP213/214

driven low prior to the end of Power-On Reset (POR). After POR has completed the device

will remain in ISP mode until RST is brought high. Once the initial ISP session has ended, the

power to the target device must be cycled OFF and ON to enter another session.

•The SS pin should not be left floating during reset if ISP is enabled.

• The ISP Enable Fuse must be set to allow programming during any reset period. If the ISP

Fuse is disabled, ISP may only be entered at POR.

23.2

Memory Organization

The AT89LP213/214 offers 2K bytes of In-System Programmable (ISP) nonvolatile Flash code

memory. In addition, the device contains a 64-byte User Signature Array and a 32-byte read-

only Atmel Signature Array. The memory organization is shown in Table 23-1 and Figure 23-2.

The memory is divided into pages of 32 bytes each. A single read or write command may only

access a single page in the memory. Each memory type resides in its own address space and is

accessed by commands specific to that memory. However, all memory types share the same

page size.

User configuration fuses are mapped as a row in the memory, with each byte representing one

fuse. From a programming standpoint, fuses are treated the same as normal code bytes except

they are not affected by Chip Erase. Fuses can be enabled at any time by writing 00h to the

appropriate locations in the fuse row. However, to disable a fuse, i.e. set it to FFh, the entire

fuse row must be erased and then reprogrammed. The programmer should read the state of all

the fuses into a temporary location, modify those fuses which need to be disabled, then issue a

Fuse Write with Auto-Erase command using the temporary data. Lock bits are treated in a simi-

lar manner to fuses except they may only be erased (unlocked) by Chip Erase.

Figure 23-2. AT89LP213/214 Memory Organization

Table 23-1.

Code Memory Sizes

Device #

Code Size

Page Size

# Pages

Address Range

AT89LP213

2K bytes

32 bytes

0000H - 07FFH

AT89LP214

2K bytes

32 bytes

0000H - 07FFH

Page 0

Page 1

Page 63

Page 62

Page 0

User Fuse Row

User Signature Array

Atmel Signature Array

Code Memory

Page 1

0000

07FF

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