AT89LP216 Atmel Corporation, AT89LP216 Datasheet - Page 7

• 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

6.2
3621E–MICRO–11/10
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
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.
LO WER
UPPER
128
128
FFH
7F H
80H
0
Data Memory Map
and Indirect
Addressing
Addressing
Accessible
Accessible
By Direct
By Direct
Only
Only
Special Function
Registers
(Figure
6-2). The I/O memory can only
Ports
Status and Control Bits
Timers
Registers
Stack Pointer
Accumulator
(Etc.)
AT89LP216
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