AT89LP6440-20AU Atmel, AT89LP6440-20AU Datasheet - Page 12

• Manufacturer Part Number: AT89LP6440-20AU
• Description: MCU 8051 64K FLASH ISP 44TQFP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20AU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Package: 44TQFP
• Device Core: 8051
• Family Name: 89LP
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 38
• Interface Type: 2-Wire/SPI
• On-chip Dac: 8-chx10-bit
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.2.2
3.2.3
3.3
3.3.1
12
External Data Memory
AT89LP6440 - Preliminary
IDATA
SFR
XDATA
The full 256 byte internal RAM can be indirectly addressed using the 8-bit pointers R0 and R1.
The first 128 bytes of IDATA include the DATA space. The hardware stack is also located in the
IDATA space when XSTK = 0.
The upper 128 direct addresses (80H–FFH) access the I/O registers. I/O registers on AT89LP
devices are referred to as Special Function Registers. The SFRs can only be accessed through
direct addressing. All SFR locations are not implemented. See
SFRs.
AT89LP microcontrollers support a 16-bit external memory address space for up to 64K bytes of
external data memory (XDATA). The external memory space is accessed with the MOVX
instructions. Some internal data memory resources are mapped into portions of the external
address space as shown in
the CPU can access them. The AT89LP6440 includes 4K bytes of on-chip Extra RAM (EDATA)
and 8K bytes of nonvolatile Flash data memory (FDATA).
Figure 3-3.
The external data memory space can accommodate up to 64KB of external memory. The
AT89LP6440 uses the standard 8051 external memory interface with the upper address byte on
Port 2, the lower address byte and data in/out multiplexed on Port 0, and the ALE, RD and WR
strobes. MOVX instructions targeted to XDATA require a minimum of 4 clock cycles. XDATA can
be accessed with both 16-bit (MOVX @DPTR) and 8-bit (MOVX @Ri) addresses. See
3.3.4 on page 16
0000
FFFF
(XDATA: 64KB)
External Data
External Data Memory Map
EXRAM = 1
for more details of the external memory interface.
Figure
3-3. These memory spaces may require configuration before
1000
0FFF
FFFF
(XDATA: 60KB)
External Data
(EDATA: 4KB)
EXRAM = 0
Extra RAM
DMEN = 0
Section 4.
3000
1000
2FFF
0FFF
FFFF
for a listed of available
(XDATA: 52KB)
External Data
(FDATA: 8KB)
(EDATA: 4KB)
EXRAM = 0
Flash Data
Extra RAM
DMEN = 1
3706A–MICRO–9/09
Section