AT89LP51ID2 Atmel Corporation, AT89LP51ID2 Datasheet - Page 167

• Manufacturer Part Number: AT89LP51ID2
• Manufacturer: Atmel Corporation

Specifications of AT89LP51ID2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 42
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 7
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 2.25
• Eeprom (bytes): 4096
• Self Program Memory: API
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 4
• Isp: SPI/OCD/UART
• Watchdog: Yes

Figure 21-1. DADC Block Diagram
3714A–MICRO–7/11
GND
P0.6
TEMP
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
VDD
REFERENCE
INTERNAL
VDD/8
7R
1.0V
R
VDD/8
8-BIT DATA BUS
R
R
VDD/2
To convert the unsigned binary value back to 2’s complement, subtract 02h from DADH in right-
adjusted mode or 80h from DADH in left-adjusted mode. Note that the DADH/DADL registers
cannot be directly manipulated as they are read-only in ADC mode and write-only in DAC mode.
INPUT
INPUT
POS.
NEG.
MUX
MUX
ADC INPUT SELECT
REGISTER (DADI)
CHANNEL SELECTION
SAMPLE &
+
-
HOLD
AT89LP51RD2/ED2/ID2 Preliminary
TRIGGER
SELECT
Overflows
DA+
Timer
DA-
ADC CTRL & STATUS
REGISTER (DADC)
INTERRUPT
10-BIT SAR
FLAG
PRESCALER
15
ADC DATA REGISTER
(DADH/DADL)
0
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