C8051F700-GQR Silicon Laboratories Inc, C8051F700-GQR Datasheet - Page 57
C8051F700-GQR
Manufacturer Part Number
C8051F700-GQR
Description
MCU 8-Bit C8051F70x 8051 CISC 15KB Flash 1.8V/3V 64-Pin TQFP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F700DK.pdf
(306 pages)
Specifications of C8051F700-GQR
Package
64TQFP
Device Core
8051
Family Name
C8051F70x
Maximum Speed
25 MHz
Ram Size
512 Byte
Program Memory Size
15 KB
Operating Supply Voltage
1.8|3 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
54
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
16-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
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10.3.2. Tracking Modes
The AD0TM bit in register ADC0CN enables "delayed conversions", and will delay the actual conversion
start by three SAR clock cycles, during which time the ADC will continue to track the input. If AD0TM is left
at logic 0, a conversion will begin immediately, without the extra tracking time. For internal start-of-conver-
sion sources, the ADC will track anytime it is not performing a conversion. When the CNVSTR signal is
used to initiate conversions, ADC0 will track either when AD0TM is logic 1, or when AD0TM is logic 0 and
CNVSTR is held low. See Figure 10.2 for track and convert timing details. Delayed conversion mode is
useful when AMUX settings are frequently changed, due to the settling time requirements described in
Section “10.3.3. Settling Time Requirements” on page 58.
Timer 0, Timer 2, Timer 1 Overflow
(AD0CM[2:0]=000, 001, 010, 011)
Write '1' to AD0BUSY,
Figure 10.2. 10-Bit ADC Track and Conversion Example Timing
(AD0CM[2:0]=1xx)
SAR Clocks
AD0TM=1
AD0TM=0
AD0TM=1
AD0TM=0
CNVSTR
Clocks
Clocks
Clocks
SAR
SAR
SAR
N/C
Track or
Convert
A. ADC Timing for External Trigger Source
B. ADC Timing for Internal Trigger Source
Track
Track
Track
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15* 16 17
1 2 3 4 5 6 7 8 9 10 11 12* 13 14
Rev. 1.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15* 16 17
1 2 3 4 5 6 7 8 9 10 11 12* 13 14
Convert
Convert
*Conversion Ends at rising edge of 15
*Conversion Ends at rising edge of 12
*Conversion Ends at rising edge of 15
*Conversion Ends at rising edge of 12
Convert
Convert
C8051F70x/71x
th
th
th
clock in 8-bit Mode
th
clock in 8-bit Mode
clock in 8-bit Mode
Track
clock in 8-bit Mode
N/C
Track
Track
57
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