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NUC220-LE1N Fiches technique(PDF) 76 Page - Nuvoton Technology Corporation

No de pièce NUC220-LE1N
Description  ARM짰 Cortex짰-M 32-bit Microcontroller
Download  107 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

NUC220-LE1N Fiches technique(HTML) 76 Page - Nuvoton Technology Corporation

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NUC100/120xxxDN
Aug 31, 2015
Page 76 of 107
Rev 1.01
UART Interface Controller (UART)
6.14
The NuMicro
®
NUC100 series provides up to three channels of Universal Asynchronous
Receiver/Transmitters (UART). UART0 supports High Speed UART and UART1~2 perform
Normal Speed UART. Besides, only UART0 and UART1 support the flow control function.
6.14.1
Overview
The
Universal
Asynchronous
Receiver/Transmitter
(UART)
performs
a
serial-to-parallel
conversion on data received from the peripheral, and a parallel-to-serial conversion on data
transmitted from the CPU. The UART controller also supports IrDA SIR, LIN master/slave mode
and RS-485 mode functions. Each UART channel supports seven types of interrupts including:
Transmitter FIFO empty interrupt (INT_THRE)
Receiver threshold level reached interrupt (INT_RDA),
Line status interrupt (parity error or frame error or break interrupt) (INT_RLS),
Receiver buffer time-out interrupt (INT_TOUT),
MODEM/Wake-up status interrupt (INT_MODEM),
Buffer error interrupt (INT_BUF_ERR)
LIN interrupt (INT_LIN)
Interrupts of UART0 and UART2 share the interrupt number 12 (vector number is 28); Interrupt
number 13 (vector number is 29) only supports UART1 interrupt. Refer to the Nested Vectored
Interrupt Controller chapter for System Interrupt Map.
The UART0 is built-in with a 64-byte transmitter FIFO (TX_FIFO) and a 64-byte receiver FIFO
(RX_FIFO) that reduces the number of interrupts presented to the CPU. The UART1~2 are
equipped with 16-byte transmitter FIFO (TX_FIFO) and 16-byte receiver FIFO (RX_FIFO). The
CPU can read the status of the UART at any time during the operation. The reported status
information includes the type and condition of the transfer operations being performed by the
UART, as well as 4 error conditions (parity error, frame error, break interrupt and buffer error)
probably occur while receiving data. The UART includes a programmable baud rate generator
that is capable of dividing clock input by divisors to produce the serial clock that transmitter and
receiver need. The baud rate equation is Baud Rate = UART_CLK / M * [BRD + 2], where M and
BRD are defined in Baud Rate Divider Register (UA_BAUD). Table 6-6 lists the equations in the
various conditions and Table 6-7 lists the UART baud rate setting table.
Mode
DIV_X_EN
DIV_X_ONE
Divider X
BRD
Baud Rate Equation
0
0
0
Don’t care
A
UART_CLK / [16 * (A+2)]
1
1
0
B
A
UART_CLK / [(B+1) * (A+2)] , B must >= 8
2
1
1
Don’t care
A
UART_CLK / (A+2), A must >=3
Table 6-6 UART Baud Rate Equation
System Clock = Internal 22.1184 MHz High Speed Oscillator
Baud Rate
Mode 0
Mode 1
Mode 2
Parameter
Register
Parameter
Register
Parameter
Register
921600
x
x
A=0,B=11
0x2B00_0000
A=22
0x3000_0016


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