AT89C5132-ROTIL Atmel, AT89C5132-ROTIL Datasheet - Page 148

• Manufacturer Part Number: AT89C5132-ROTIL
• Description: IC 8051 MCU FLASH 64K USB 80TQFP
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5132-ROTIL

• Core Processor: C52X2
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IDE/ATAPI, I²C, MMC, PCM, SPI, UART/USART, USB
• Peripherals: I²S, POR, WDT
• Number Of I /o: 44
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

21.1.1
21.1.2
21.1.3
148
AT89C5132
Clock Generator
Channel Selection
Conversion Precision
Figure 21-2. Timing Diagram
The ADC clock is generated by division of the peripheral clock (see details in Section “X2 Fea-
ture”, page 12). The division factor is then given by ADCP4:0 bits in ADCLK register. Figure 21-
3 shows the ADC clock generator and its calculation formula
Figure 21-3. ADC Clock Generator and Symbol Caution:
Note:
The channel on which conversion is performed is selected by the ADCS bit in ADCON register
according to Table 30.
Table 30. ADC Channel Selection
The 10-bit precision conversion is achieved by stopping the CPU core activity during conversion
for limiting the digital noise induced by the core. This mode called the Pseudo-Idle mode
enabled by setting the ADIDL bit in ADCON register
Section "Conversion Launching", page 149), the CPU core is stopped until the end of the con-
1. In all cases, the ADC clock frequency may be higher than the maximum F
2. The ADCD value of 0 is equivalent to an ADCD value of 32.
ADEOC
ADSST
CLOCK
ADEN
reported in the Section “Analog to Digital Converter”, page 201.
PER
CLK
ADCS
T
0
1
÷ 2
SETUP
T
ADCD4:0
ADCLK
ADCLK
ADCclk
=
(3)
-------------------------
2 ADCD
PERclk
⋅
. Thus, when conversion is launched (see
T
ADC Clock
CONV
(1)
.
Channel
AIN1
AIN0
ADC Clock Symbol
CLOCK
ADCLK
ADC
4173E–USB–09/07
parameter
(1),(2)
is