C8051F553-IM Silicon Laboratories Inc, C8051F553-IM Datasheet - Page 99
![IC 8051 MCU 32K FLASH 24-QFN](/photos/12/15/121587/c8051f9xx_24-qfn_sml.jpg)
C8051F553-IM
Manufacturer Part Number
C8051F553-IM
Description
IC 8051 MCU 32K FLASH 24-QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F55xr
Specifications of C8051F553-IM
Program Memory Type
FLASH
Program Memory Size
32KB (32K x 8)
Package / Case
24-QFN
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, Temp Sensor, WDT
Number Of I /o
18
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.25 V
Data Converters
A/D 18x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Processor Series
C8051F5x
Core
8051
Data Bus Width
8 bit
Data Ram Size
2304 B
Maximum Clock Frequency
50 MHz
Number Of Programmable I/os
18
Operating Supply Voltage
1.8 V to 5.25 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F540DK
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1691 - KIT DEVELOPMENT FOR C8051F560
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1686-5
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While in the CAN0 ISR, a PCA interrupt occurs. Recall the PCA interrupt is configured as a high priority
interrupt, while the CAN0 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 0x0C for CAN0) 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 0x00 for SPI0DAT) 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 12.4.
Figure 12.4. SFR Page Stack Upon PCA Interrupt Occurring During a CAN0 ISR
SFRPAGE
SFRNEXT
SFRNEXT
pushed to
SFRLAST
pushed to
(SPI0DAT)
SFRPAGE on PCA
pushed on stack in
(CAN0)
SFR Page 0x0
Automatically
(PCA)
0xC
0x0
0x0
interrupt
Rev. 1.1
C8051F55x/56x/57x
SFRPAGE
SFRNEXT
SFRLAST
99
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