C8051F066-GQ Silicon Laboratories Inc, C8051F066-GQ Datasheet - Page 136
C8051F066-GQ
Manufacturer Part Number
C8051F066-GQ
Description
MCU 8-Bit C8051F06x 8051 CISC 32KB Flash 3.3V 100-Pin TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F06xr
Specifications of C8051F066-GQ
Package
100TQFP
Device Core
8051
Family Name
C8051F06x
Maximum Speed
25 MHz
Operating Supply Voltage
3.3 V
Data Bus Width
8 Bit
Number Of Programmable I/os
59
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
2-chx16-bit
Number Of Timers
5
Ram Size
4.25 KB
Program Memory Size
32 KB
Program Memory Type
Flash
Operating Temperature
-40 to 85 °C
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
59
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 2x16b
Oscillator Type
Internal
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
336-1221
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C8051F060/1/2/3/4/5/6/7
While in the ADC2 ISR, a PCA interrupt occurs. Recall the PCA interrupt is configured as a high priority
interrupt, while the ADC2 interrupt is configured as a low priority interrupt. Thus, the CIP-51 will now vector
to the high priority PCA ISR. Upon doing so, the CIP-51 will automatically place the SFR page needed to
access the PCA’s special function registers into the SFRPAGE register, SFR Page 0x00. The value that
was in the SFRPAGE register before the PCA interrupt (SFR Page 2 for ADC2) is pushed down the stack
into SFRNEXT. Likewise, the value that was in the SFRNEXT register before the PCA interrupt (in this
case SFR Page 0x0F for Port 5) is pushed down to the SFRLAST register, the “bottom” of the stack. Note
that a value stored in SFRLAST (via a previous software write to the SFRLAST register) will be overwritten.
See Figure 13.6 below.
136
Figure 13.6. SFR Page Stack Upon PCA Interrupt Occurring During an ADC2 ISR
SFRNEXT
SFRLAST
SFRPAGE
pushed to
SFRNEXT
pushed to
SFRPAGE on PCA
pushed on stack in
SFR Page 0x00
(ADC2)
(Port 5)
Automatically
(PCA)
0x0F
0x00
0x02
interrupt
Rev. 1.2
SFRPAGE
SFRNEXT
SFRLAST
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