AT80C51SND1C-ROTIL Atmel, AT80C51SND1C-ROTIL Datasheet - Page 175

• Manufacturer Part Number: AT80C51SND1C-ROTIL
• Description: IC MCU FLASH MP3 DECODER 80-TQFP
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51SND1C-ROTIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 44
• Program Memory Type: ROMless
• 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
• Eeprom Size: -
• Program Memory Size: -
• Other names: AT80C51SND1CROTIL

21.1.1
21.1.2
21.1.3
4109L–8051–02/08
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 13). 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 147.
Table 147. 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 176), 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 199.
PER
CLK
T
÷ 2
SETUP
ADCS
0
1
T
ADCD4:0
ADCLK
ADCLK
ADCclk
=
(3)
-------------------------
2 ADCD
PERclk
⋅
. Thus, when conversion is launched (see
T
ADC Clock
CONV
(1)
.
AT8xC51SND1C
Channel
AIN1
AIN0
ADC Clock Symbol
CLOCK
ADCLK
ADC
parameter
(1),(2)
175
is