AT89C51AC3-RLTIM Atmel, AT89C51AC3-RLTIM Datasheet - Page 107
AT89C51AC3-RLTIM
Manufacturer Part Number
AT89C51AC3-RLTIM
Description
IC 8051 MCU FLASH 64K 44VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51AC3-RLTUM.pdf
(140 pages)
Specifications of AT89C51AC3-RLTIM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
36
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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ADC Converter
Operation
Voltage Conversion
Clock Selection
4383D–8051–02/08
A start of single A/D conversion is triggered by setting bit ADSST (ADCON.3).
After completion of the A/D conversion, the ADSST bit is cleared by hardware.
The end-of-conversion flag ADEOC (ADCON.4) is set when the value of conversion is
available in ADDH and ADDL, it must be cleared by software. If the bit EADC (IEN1.1) is
set, an interrupt occur when flag ADEOC is set (see Figure 62). Clear this flag for re-
arming the interrupt.
The bits SCH0 to SCH2 in ADCON register are used for the analog input channel
selection.
Table 57. Selected Analog input
When the ADCIN is equals to VAREF the ADC converts the signal to 3FFh (full scale). If
the input voltage equals VAGND, the ADC converts it to 000h. Input voltage between
VAREF and VAGND are a straight-line linear conversion. All other voltages will result in
3FFh if greater than VAREF and 000h if less than VAGND.
Note that ADCIN should not exceed VAREF absolute maximum range! (See section
“AC-DC”)
The ADC clock is the same as CPU.
The maximum clock frequency is defined in the DC parmeters for A/D converter. A pres-
caler is featured (ADCCLK) to generate the ADC clock from the oscillator frequency.
f
if PRS > 0 then f
if PRS = 0 then f
ADC
= fcpu clock/ (4 (or 2 in X2 mode)* PRS )
SCH2
0
0
0
0
1
1
1
1
ADC
ADC
= F
= F
periph
periph
/ 2 x PRS
/ 64
SCH1
0
0
1
1
0
0
1
1
SCH0
0
1
0
1
0
1
0
1
Selected Analog input
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
107
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