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NUC120-YB2C Fiches technique(PDF) 49 Page - Nuvoton Technology Corporation

No de pièce NUC120-YB2C
Description  ARM Cortex??M0 32-BIT MICROCONTROLLER
Download  89 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

NUC120-YB2C Fiches technique(HTML) 49 Page - Nuvoton Technology Corporation

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NuMicro
™ NUC120 Data Sheet
Publication Release Date: Jan. 2, 2012
- 49 -
Revision V2.03
5.11.2 Features
18-bit free running counter to avoid chip from Watchdog timer reset before the delay time
expires.
Selectable time-out interval (2
4 ~ 218) and the time out interval is 104 ms ~ 26.3168 s (if
WDT_CLK = 10 kHz).
Reset period = (1 / 10 kHz) * 63, if WDT_CLK = 10 kHz.
5.12 UART Interface Controller (UART)
NuMicro
™ NUC100/NUC120 Medium Density 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 flow control function.
NuMicro
™ NUC100/NUC120 Low Density only supports UART0 and UART1.
5.12.1 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 Function and RS-485
mode functions. Each UART channel supports seven types of interrupts including transmitter
FIFO empty interrupt (INT_THRE), receiver threshold level reaching interrupt (INT_RDA), line
status interrupt (parity error or framing error or break interrupt) (INT_RLS), receiver buffer time out
interrupt (INT_TOUT), MODEM/Wake-up status interrupt (INT_MODEM) and Buffer error interrupt
(INT_BUF_ERR). Inte
umber 12 (vector number
is 28); Interrupt number 13 (vector number is 29) only supports UART1 interrupt. Refer to 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 and the UART1~2 are
equipped 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, framing 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 5-6 lists the equations in the various conditions
and Table 5-7 list the UART baud rate setting table.
rrupts of UART0 and UART2 share the interrupt n
Mode
DIV_X_EN
DIV_X_ONE
Divider X
BRD Baud rate equation
0
0
0
B
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 5-6 UART Baud Rate Equation


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