参数资料
型号: MB89T635P-SH
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 10 MHz, MICROCONTROLLER, PDIP64
封装: SHRINK, DIP-64
文件页数: 144/153页
文件大小: 7326K
代理商: MB89T635P-SH
HARDWARE CONFIGURATION
2-67
(4) Description of operation
(a) Operation modes
The UART has the operation modes listed in Table 2-2; they can be switched by setting the value at the
serial mode control register (SMC).
Table 2.8 Operation Modes of UART
However, the stop bit length can be specified only for the transmitter channel. The 1-bit length is always
specified for the receiver channel.
(b) Interrupt occurrence and flag setting conditions
The UART has three flags and two interrupt sources.
The three flags are ORFE, RDRF, and TDRE. The ORFE flag is an overrun/framing error flag which is set
when an error occurs at receiving. The RDRF flag indicates that the receive data is ready at the SIDR reg-
ister. The TDRE flag indicates that writing to the transmit data register (SODR) is enabled.
The two interrupt sources are one for receiving, and one for transmitting. At receiving, an interrupt is re
quested by the RDRF or ORFE flag. At transmitting, an interrupt is requested by the TDRE flag.
Receiving in modes 0, 1, and 3
Both the RDRF (receive data register full) and ORFE (overrun/framing error) flags are set when receiving
and transfer are completed and the last stop bit is detected. An interrupt request is then output to the CPU.
When the RDRF flag is active, the received data is transferred to the serial data input register (SIDR).
Fig. 2.9 RDRF Flag Set Timing
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