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CHAPTER 19 UART
■
Interrupt of UART, DMA transfer, and EI
Table 19.4-1 shows the relationship between the interrupt source, interrupt vector, and interrupt
control register other than software interrupt.
Table 19.4-1 Interrupt source, interrupt vector, and interrupt control register
transmission completion
UART
reception completion
UART
❍
: Interrupt request flag is cleared.
: Interrupt request flag is cleared (stop request).
* :
This interrupt source shares the interrupt number with interrupt source of other peripheral functions.
For details, see Table 3.2-2.
Note:
If there are two interrupt sources in the same interrupt number, resource clears both interrupt
request flags. Therefore, when one of two sources uses the EI
interrupt function cannot use. The interrupt request enable bit of the relevant resource is set to 0 to
execute the software polling processing.
■
Correspondence to DMA transfer and EI
The UART corresponds to the DMA transfer function and EI
2
EI
OS function is used, it is necessary to disable other interrupt that shares the interrupt control
register (ICR).
422
Interrupt source
*
*
2
OS
μDMAC
Interrupt vector
2
EI
OS
channel
clear
Number
number
❍
11
#34
7
#36
2
OS function
Interrupt control register
Address
Number
FFFF74
0000BB
ICR11
H
FFFF6C
0000BC
ICR12
H
2
OS/μDMAC function, the other
2
OS function. When the DMA or
Address
H
H
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