AT89LP6440-20AU Atmel, AT89LP6440-20AU Datasheet - Page 13

• 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

3.3.2
Table 3-2.
3.3.3
3.3.3.1
3706A–MICRO–9/09
Symbol
PAGE
PAGE = 86H
Not Bit Addressable
Bit
7-0
EDATA
FDATA
Write Protocol
Function
Selects which 256-byte page of EDATA is currently accessible by MOVX @Ri instructions when PAGE < 10H. Any PAGE
value between 10H and FFH will selected XDATA; however, this value will not be output on P2.
PAGE
PAGE.7
7
– EDATA Page Register
Some internal data memory spaces are mapped into portions of the XDATA address space. In
this case the lower address ranges will access internal resources instead of external memory.
Addresses above the range implemented internally will default to XDATA. The AT89LP6440
supports up to 52K or 60K bytes of external memory when using the internally mapped memo-
ries. Setting the EXRAM bit (AUXR.1) to one will force all MOVX instructions to access the entire
64KB XDATA regardless of their address (See
The Extra RAM is a portion of the external memory space implemented as an internal 4K byte
auxiliary RAM. The Extra RAM is mapped into the EDATA space at the bottom of the external
memory address space, from 0000H to 0FFFH. MOVX instructions to this address range will
access the internal Extra RAM. EDATA can be accessed with both 16-bit (MOVX @DPTR) and
8-bit (MOVX @Ri) addresses. When 8-bit addresses are used, the PAGE register (086H) sup-
plies the upper address bits. The PAGE register breaks EDATA into sixteen 256-byte pages. A
page cannot be specified independently for MOVX @R0 and MOVX @R1. Setting PAGE above
0FH enables XDATA access, but does not change the value of Port 2. When 16-bit addresses
are used (DPTR), the IAP bit (MEMCON.7) must be zero to access EDATA. MOVX instructions
to EDATA require a minimum of 2 clock cycles.
The Flash Data Memory is a portion of the external memory space implemented as an internal
nonvolatile data memory. Flash Data Memory is enabled by setting the DMEN bit (MEMCON.3)
to one. When IAP = 0 and DMEN = 1, the Flash Data Memory is mapped into the FDATA space,
directly above the EDATA space near the bottom of the external memory address space, from
1000H to 2FFFH. (See
internal nonvolatile memory. FDATA is not accessible while DMEN = 0. FDATA can be
accessed only by 16-bit (MOVX @DPTR) addresses. MOVX @Ri instructions to the FDATA
address range will access external memory. Addresses above the FDATA range are mapped to
XDATA. MOVX instructions to FDATA require a minimum of 4 clock cycles.
The FDATA address space accesses an internal nonvolatile data memory. This address space
can be read just like EDATA by issuing a MOVX A,@DPTR; however, writes to FDATA require a
more complex protocol and take several milliseconds to complete. The AT89LP6440 uses an
idle-while-write architecture where the CPU is placed in an idle state while the write occurs.
When the write completes, the CPU will continue executing with the instruction after the
MOVX @DPTR,A instruction that started the write. All peripherals will continue to function during
the write cycle; however, interrupts will not be serviced until the write completes.
PAGE.6
6
PAGE.5
5
Figure
PAGE.4
4
3-3). MOVX instructions to this address range will access the
PAGE.3
3
AT89LP6440 - Preliminary
“AUXR – Auxiliary Control Register” on page
PAGE.2
2
Reset Value = 0000 0000B
PAGE.1
1
PAGE.0
0
17).
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