参数资料
型号: IA88C00-PLC68I-R
厂商: Innovasic Semiconductor
英文描述: Microcontroller
中文描述: 微控制器
文件页数: 34/80页
文件大小: 707K
代理商: IA88C00-PLC68I-R
IA88C00
Microcontroller
Data Sheet
As of Production Version -01
Copyright
2005 ENG 21 0 050519-00 www.Innovasic
Innovasic.com
Innovasic Semiconductor
Page 34 of 80 1.888.824.4184
D4 - FERR - Framing Error
- This is a status bit. If a framing error occurs (no stop bit where expected),
this bit is set for the receive character in which the framing error occurred. This bit remains set until
cleared to 0 by writing a 1 to this bit position.
D5 - BRKD - Break Detect
- This is a status bit that is set at the beginning and the end of a break
sequence in the receive data stream. It stays set to 1 until cleared to 0 by writing a 1 to this bit position.
A break signal is a sequence of 0s. When all the required bits, parity bit, wake-up bit, and stop bits are 0x,
the receiver immediately recognizes a break condition (not a framing error) and causes Break Detect
(BRKD) to be set and an interrupt request. At the end of the break signal, a zero character is loaded into
the Receive Data Register (UIOR) and Break Detect is set again, along with another interrupt request.
D6 - CCD - Control Character Detect
- This status bit is set any time an ASCII control character is
received in the receive data stream. It stays set until cleared to 0 by writing a 1 to this bit position. (An
ASCII control character is any character that has bits 5 and 6 set to 0.)
D7 - WUD - Wake-Up Detect
- This status bit is set any time a valid wake-up condition is detected at the
receiver. It stays set until cleared to 0 by writing a 1 to this bit position. The wake-up condition can be
satisfied in many possible ways by the Wake-up bit, Wake-up Match register, and Wake-Up Mask
register.
Figure 31. UART Interrupt Enable (UIE), R237 Bank 0
Bit
7
D7
0
R/W
6
D6
0
R/W
5
D5
0
R/W
4
D4
0
R/W
3
D3
0
R/W
2
D2
0
R/W
1
D1
0
R/W
0
D0
0
R/W
Initial Value
Read/Write
D0 - RCAIE - Receive Character Available Interrupt Enable
- If this bit is set to 1, a Receive
Character Available status in the URC register will cause an interrupt request. In a DMA receive
operation, if this bit is set to 1, an interrupt request will be issued only if an End-of-Process (EOP) of the
DMA counter is also set. If it is not set, a Receive Character Available status causes no interrupt.
D1 - RDMAENB - Receive DMA Enabl
e - When this bit is set to 1, the DMA function is enabled for the
UART receiver. Whenever a Receive Character Available signal in the URC register is true, a DMA
request will be made. When the DMA channel claims control of the bus, it transfers the received data to
the register file or the external memory.
D2 - TIE - Tranmit Interrupt Enable
- If this bit is set to 1, a Transmit Buffer Empty signal in the UTC
register will cause an interrupt request. In a DMA transmit operation, if this bit is set to 1, an interrupt
request will be issued only if an End-of-Process (EOP) of the DMA counter is also set. If it is not set, a
Transmit Buffer Empty signal causes no interrupt.
D3 - ZCIE - Zero Count Interrupt Enable
- If this bit is set to 1, a baud-rate generator Zero Count
status in the UTC register will cause an interrupt request.
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