C8051F131R Silicon Labs, C8051F131R Datasheet - Page 140

• Manufacturer Part Number: C8051F131R
• Description: 8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
• Manufacturer: Silicon Labs

Specifications of C8051F131R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 100 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 9
• Data Rom Size: 64 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
On exit from the PCA interrupt service routine, the CIP-51 will return to the ADC2 Window Comparator
ISR. On execution of the RETI instruction, SFR Page 0x00 used to access the PCA registers will be auto-
matically popped off of the SFR Page Stack, and the contents of the SFRNEXT register will be moved to
the SFRPAGE register. Software in the ADC2 ISR can continue to access SFR’s as it did prior to the PCA
interrupt. Likewise, the contents of SFRLAST are moved to the SFRNEXT register. Recall this was the
SFR Page value 0x0F being used to access Port 5 before the ADC2 interrupt occurred. See Figure 11.8
below.
140
Figure 11.7. SFR Page Stack Upon PCA Interrupt Occurring During an ADC2 ISR
Figure 11.8. SFR Page Stack Upon Return From PCA Interrupt
SFRNEXT
SFRNEXT
SFRLAST
SFRLAST
SFRPAGE
popped to
SFRPAGE
SFRNEXT
pushed to
SFRNEXT
popped to
pushed to
stack on return from
SFRPAGE on PCA
pushed on stack in
popped off of the
SFR Page 0x00
(ADC2)
(Port 5)
SFR Page 0x00
(ADC2)
(Port 5)
Automatically
Automatically
(PCA)
0x0F
0x02
0x0F
0x00
0x02
interrupt
interrupt
Rev. 1.4
SFRPAGE
SFRNEXT
SFRPAGE
SFRLAST
SFRNEXT
SFRLAST