AT89LP6440-20JU Atmel, AT89LP6440-20JU Datasheet - Page 16

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

Specifications of AT89LP6440-20JU

• 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-PLCC
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: 2-Wire, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 3-3.
3.3.4
16
Symbol
IAP
AERS
LDPG
MWEN
DMEN
ERR
WRTINH
MEMCON = 96H
Not Bit Addressable
Bit
AT89LP6440 - Preliminary
External Memory Interface
Function
In-Application Programming Enable. When IAP = 1 and the IAP Fuse is enabled, programming of the CODE/SIG space
is enabled and MOVX @DPTR instructions will access CODE/SIG instead of EDATA or FDATA. Clear IAP to disable
programming of CODE/SIG and allow access to EDATA and FDATA.
Auto-Erase Enable. Set to perform an auto-erase of a Flash memory page (CODE, SIG or FDATA) during the next write
sequence. Clear to perform write without erase.
Load Page Enable. Set to this bit to load multiple bytes to the temporary page buffer. Byte locations may not be loaded
more than once before a write. LDPG must be cleared before writing.
Memory Write Enable. Set to enable programming of a nonvolatile memory location (CODE, SIG or FDATA). Clear to
disable programming of all nonvolatile memories.
Data Memory Enable. Set to enable nonvolatile data memory and map it into the FDATA space. Clear to disable
nonvolatile data memory.
Error Flag. Set by hardware if an error occurred during the last programming sequence due to a brownout condition (low
voltage on VDD). Must be cleared by software.
Write Inhibit Flag. Cleared by hardware when the voltage on VDD has fallen below the minimum programming voltage.
Set by hardware when the voltage on VDD is above the minimum programming voltage.
MEMCON
IAP
7
– Memory Control Register
The AT89LP6440 uses the standard 8051 external memory interface with the upper address on
Port 2, the lower address and data in/out multiplexed on Port 0, and the ALE, RD and WR
strobes. The interface may be used in two different configurations depending on which type of
MOVX instruction is used to access XDATA.
Figure 3-7
a 16-bit linear address. Port 0 serves as a multiplexed address/data bus to the RAM. The
Address Latch Enable strobe (ALE) is used to latch the lower address byte into an external reg-
ister so that Port 0 can be freed for data input/output. Port 2 provides the upper address byte
throughout the operation. The MOVX @DPTR instructions use Linear Address mode
Figure 3-7.
AERS
6
shows a hardware configuration for accessing up to 64K bytes of external RAM using
External Memory 16-bit Linear Address Mode
LDPG
5
MWEN
P1
RD
WR
4
AT89LP
P3
ALE
P0
P2
DMEN
3
LATCH
ERR
2
DATA
EXTERNAL
WE
MEMORY
ADDR
Reset Value = 0000 00XXB
DATA
OE
–
1
WRTINH
3706A–MICRO–9/09
0