AT89LP216 Atmel Corporation, AT89LP216 Datasheet - Page 6

• Manufacturer Part Number: AT89LP216
• Manufacturer: Atmel Corporation

Specifications of AT89LP216

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 14
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.125
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI/OCD
• Watchdog: Yes

6. Memory Organization
6.1
6
Program Memory
AT89LP216
The AT89LP216 uses a Harvard Architecture with separate address spaces for program and
data memory. The program memory has a regular linear address space with support for up to
64K bytes of directly addressable application code. The data memory has 128 bytes of internal
RAM and 128 bytes of Special Function Register I/O space. The AT89LP216 does not support
external data memory or external program memory.
The AT89LP216 contains 2K bytes of on-chip In-System Programmable Flash memory for pro-
gram storage. The Flash memory has an endurance of at least 10,000 write/erase cycles and a
minimum data retention time of 10 years. The reset and interrupt vectors are located within the
first 59 bytes of program memory (refer to
cated within the entire 2K program memory address space for access by the MOVC instruction.
The AT89LP216 does not support external program memory.
Figure 6-1.
A map of the AT89LP216 program memory is shown in
space from 0000h to 07FFh, the AT89LP216 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 fashion. 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.
Table 6-1.
AUXR1 = A2H
Not Bit Addressable
Bit
–
7
Program Memory Map
AUXR1
– Auxiliary Register 1
–
6
0040
0000
0000
007F
001F
07FF
–
5
Atmel Signature Array
User Signature Array
Table 12-1 on page
Program Memory
–
4
SIGEN
3
Figure
19). Constant tables can be allo-
Reset Value = XXXX 0XXXB
6-1. In addition to the 2K code
–
2
–
1
3621E–MICRO–11/10
–
0