AT89LP6440-20MU Atmel, AT89LP6440-20MU Datasheet - Page 18
AT89LP6440-20MU
Manufacturer Part Number
AT89LP6440-20MU
Description
MCU 8051 64K FLASH ISP 44VQFN
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP6440-20MU.pdf
(194 pages)
Specifications of AT89LP6440-20MU
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-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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AT89LP6440-20MU
Manufacturer:
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AT89LP6440 - Preliminary
automatically tristated when inputting data regardless of the Port 0 configuration. The Port 0
configuration will determine the idle state of Port 0 when not accessing the external memory.
Figure 3-9
respectively. The address on P0 and P2 is stable at the falling edge of ALE. The idle polarity of
ALE is controlled by ALES (AUXR.0). When ALES = 0 the idle polarity of ALE is high (active).
When ALES = 1 the idle polarity of ALE is low (inactive). The ALE strobe pulse is always active
high. Unlike standard 8051s, ALE will not toggle continuously when not accessing external
memory. ALES must be zero in order to use P4.4 as a general-purpose I/O. The WS bits in
AUXR can extended the RD and WR strobes by 1, 2 or 3 cycles as shown in Figures 3-11, 3-12
and 3-13. If a longer strobe is required, the application can scale the system clock with the clock
divider to meet the requirements (See
Figure 3-9.
Figure 3-10. External Data Memory Read Cycle (WS = 00B)
CLK
CLK
ALE
ALE
WR
RD
P0
P2
P0
P2
and
ALES = 1
ALES = 0
ALES = 1
ALES = 0
External Data Memory Write Cycle (WS = 00B)
Figure 3-10
P0 SFR
P2 SFR
P0 SFR
P2 SFR
S1
S1
show examples of external data memory write and read cycles,
DPL or Ri OUT
DPL or Ri OUT
S2
S2
Section 6.5 on page
DATA SAMPLED
DPH or P2 OUT
DPH or P2 OUT
S3
S3
FLOAT
31).
DATA OUT
S4
S4
3706A–MICRO–9/09
P0 SFR
P2 SFR
P0 SFR
P2 SFR
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