AT89LP52-20JU Atmel, AT89LP52-20JU Datasheet - Page 44

• Manufacturer Part Number: AT89LP52-20JU
• Description: IC MCU 8051 8K FLASH SPI 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP52-20JU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-LCC (J-Lead)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

10.3
44
Port Alternate Functions
AT89LP51/52 - Preliminary
Most general-purpose digital I/O pins of the AT89LP51/52 share functionality with the various
I/Os needed for the peripheral units.
Alternate functions are connected to the pins in a logic AND fashion. In order to enable the
alternate function on a port pin, that pin must have a “1” in its corresponding port register bit,
otherwise the input/output will always be “0”. However, alternate functions may be temporarily
forced to “0” by clearing the associated port bit, provided that the pin is not in input-only mode.
Furthermore, each pin must be configured for the correct input/output mode as required by its
peripheral before it may be used as such.
use with an alternate function. If two or more port pins on the same 8-bit require difference direc-
tions, the port must be configured for bidirectional operation.
Table 10-5.
Table 10-6.
P0.0–P0.7
P2.0–P2.7
Port Pin
P1.0
P1.1
P1.5
P1.6
P1.7
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
PxM0
0
0
1
1
Pin Function Configurations for Port x Pin y
Port Pin Alternate Functions
PxM0
P1M0
P1M0
P1M0
P1M0
P1M0
P3M0
P3M0
P3M0
P3M0
P3M0
P3M0
P3M0
P3M0
Configuration Bits
PxM1
N/A
N/A
0
1
0
1
PxM1
P1M1
P1M1
P1M1
P1M1
P1M1
P3M1
P3M1
P3M1
P3M1
P3M1
P3M1
P3M1
P3M1
Table 10-6
Table 10-5
AD0–AD7
Px.y
Alternate
Function
A8–A15
X
1
1
1
lists the alternate functions of the port pins.
T2EX
MOSI
MISO
RXD
INT0
INT1
SCK
TXD
WR
RD
T2
T0
T1
shows how to configure a generic pin for
Notes
Address and data on Port 0 are
automatically configured as output
or input regardless of P0M0 and
P0M1.
T2 Clock out toggles P1.0 directly
Address on Port 2 is automatically
configured as output regardless of
P2M0 and P2M1.
T0 Clock out toggles P3.4 directly
T1 Clock out toggles P3.5 directly
I/O Mode
bidirectional (internal pull-up)
output
input
bidirectional (external pull-up)
3709B–MICRO–12/10