C8051F537-ITR Silicon Labs, C8051F537-ITR Datasheet - Page 71

• Manufacturer Part Number: C8051F537-ITR
• Description: 8-bit Microcontrollers - MCU 2KB 12ADC 125C 20Pin MCU
• Manufacturer: Silicon Labs

Specifications of C8051F537-ITR

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 2 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 16
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 2500
• Supply Voltage - Max: 2.7 V, 5.25 V
• Supply Voltage - Min: 2 V, 2.7 V

4.5.1. Window Detector In Single-Ended Mode
Figure 4.7
ADC0LTH:ADC0LTL = 0x0200 (512d) and ADC0GTH:ADC0GTL = 0x0100 (256d). The input voltage can
range from 0 to V
value. The repeat count is set to one. In the left example, an AD0WINT interrupt will be generated if the
ADC0 conversion word (ADC0H:ADC0L) is within the range defined by ADC0GTH:ADC0GTL and
ADC0LTH:ADC0LTL (if 0x0100 < ADC0H:ADC0L < 0x0200). In the right example, and AD0WINT interrupt
will be generated if the ADC0 conversion word is outside of the range defined by the ADC0GT and
ADC0LT registers (if ADC0H:ADC0L < 0x0100 or ADC0H:ADC0L > 0x0200). Figure 4.8 shows an exam-
ple using left-justified data with the same comparison values.
VREF x (4095/4096)
VREF x (4095/4096)
VREF x (512/4096)
VREF x (256/4096)
VREF x (512/4096)
VREF x (256/4096)
Input Voltage
(Px.x - GND)
Input Voltage
(Px.x - GND)
Figure 4.7. ADC Window Compare Example: Right-Justified Single-Ended Data
Figure 4.8. ADC Window Compare Example: Left-Justified Single-Ended Data
0
0
shows
ADC0H:ADC0L
ADC0H:ADC0L
REF
0x0FFF
0x01FF
0x00FF
0xFFF0
0x1FF0
0x0FF0
0x0201
0x0200
0x0101
0x0100
0x0000
0x2010
0x2000
0x1010
0x1000
0x0000
x (4095/4096) with respect to GND, and is represented by a 12-bit unsigned integer
two
example
ADC0GTH:ADC0GTL
ADC0LTH:ADC0LTL
ADC0GTH:ADC0GTL
ADC0LTH:ADC0LTL
not affected
not affected
AD0WINT
AD0WINT
not affected
not affected
AD0WINT
AD0WINT
AD0WINT=1
window
AD0WINT=1
Rev. 1.4
VREF x (512/4096)
VREF x (256/4096)
comparisons
VREF x (4095/4096)
VREF x (512/4096)
VREF x (256/4096)
VREF x (4095/
Input Voltage
(Px.x - GND)
Input Voltage
(Px.x - GND)
4096)
0
0
ADC0H:ADC0L
ADC0H:ADC0L
0x0FFF
0x0201
0x0200
0x01FF
0x0101
0x0100
0x00FF
0x0000
C8051F52x/F53x
for
0xFFF0
0x1FF0
0x0FF0
0x2010
0x2000
0x1010
0x1000
0x0000
right-justified
ADC0GTH:ADC0GTL
ADC0LTH:ADC0LTL
ADC0GTH:ADC0GTL
ADC0LTH:ADC0LTL
not affected
AD0WINT
not affected
AD0WINT
AD0WINT=1
AD0WINT=1
data
AD0WINT=1
AD0WINT=1
with
71