C8051F352 Datasheet, PDF (106/234 Pages) Silicon Laboratories – 8 k ISP Flash MCU Family

C8051F350/1/2/3
is made to service the pending interrupt. Therefore, the maximum response time for an interrupt (when no
other interrupt is currently being serviced or the new interrupt is of greater priority) occurs when the CPU is
performing an RETI instruction followed by a DIV as the next instruction. In this case, the response time is
18 system clock cycles: 1 clock cycle to detect the interrupt, 5 clock cycles to execute the RETI, 8 clock
cycles to complete the DIV instruction and 4 clock cycles to execute the LCALL to the ISR. If the CPU is
executing an ISR for an interrupt with equal or higher priority, the new interrupt will not be serviced until the
current ISR completes, including the RETI and following instruction.
Table 12.1. Interrupt Summary
Interrupt Source
Interrupt Priority
Vector Order
Pending Flag
Enable
Flag
Priority
Control
Reset
External Interrupt 0
(/INT0)
Timer 0 Overflow
External Interrupt 1
(/INT1)
Timer 1 Overflow
UART0
Timer 2 Overflow
SPI0
SMB0
RESERVED
RESERVED
ADC0
Programmable Counter
Array
Comparator0
RESERVED
Timer 3 Overflow
0x0000
0x0003
0x000B
0x0013
0x001B
0x0023
0x002B
0x0033
0x003B
0x0043
0x004B
0x0053
0x005B
0x0063
0x006B
0x0073
Top
None
N/A N/A
Always
Enabled
Always
Highest
0
IE0 (TCON.1)
Y Y EX0 (IE.0) PX0 (IP.0)
1
TF0 (TCON.5)
Y Y ET0 (IE.1) PT0 (IP.1)
2
IE1 (TCON.3)
Y Y EX1 (IE.2) PX1 (IP.2)
3
TF1 (TCON.7)
Y Y ET1 (IE.3) PT1 (IP.3)
4
RI0 (SCON0.0)
TI0 (SCON0.1)
Y N ES0 (IE.4) PS0 (IP.4)
5
TF2H (TMR2CN.7)
TF2L (TMR2CN.6)
Y
N ET2 (IE.5) PT2 (IP.5)
SPIF (SPI0CN.7)
6
WCOL (SPI0CN.6)
MODF (SPI0CN.5)
Y
N
ESPI0
(IE.6)
PSPI0
(IP.6)
RXOVRN (SPI0CN.4)
7
SI (SMB0CN.0)
Y
N
ESMB0
(EIE1.0)
PSMB0
(EIP1.0)
8
N/A
N/A N/A N/A
N/A
9
N/A
N/A N/A N/A
N/A
10
AD0INT (ADC0STA.5) Y
N
EADC0
(EIE1.3)
PADC0
(EIP1.3)
11
CF (PCA0CN.7)
CCFn (PCA0CN.n)
Y
N
EPCA0
(EIE1.4)
PPCA0
(EIP1.4)
12
CP0FIF (CPT0CN.4)
CP0RIF (CPT0CN.5)
N
N
ECP0
(EIE1.5)
PCP0
(EIP1.5)
13
N/A
N/A N/A N/A
N/A
14
TF3H (TMR3CN.7)
TF3L (TMR3CN.6)
N
N
ET3
(EIE1.7)
PT3
(EIP1.7)
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