M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 219

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

When receiving data continuously, an overrun error cannot be detected in the following situation: when the
next data reception is completed between reading the error flag by software and reading the UARTi receive
buffer register.
Fig. 7.4.13 Case of overrun error cannot be detect (using clock asynchronous seriai I/O mode)
[Precautions when operating in clock asynchronous serial I/O mode]
UARTi receive interruput
Software management
Receive complete flag
8-bit data length, parity disabled, 1 stop bit
Overrun error flag
UARTi receive
Transfer clock
buffer register
request bit
RxD
When checking this error flag by software, the microcomputer judges errors nothing because
When receiving the data B, the data B is written to the UARTi receive buffer register and the data
When reading the UARTi receive buffer register by software, the data B is read and the overrun
errors do not have occurred at data A receiving.
A is cleard and the overrun error flag becomes “1” simultaneously. The UARTi receive interrupt
request bit does not change.
error flag becomes “0” simultaneously. Accordingly, the overrun error cannot may be detected
and it is possible that the data B is managed as the data A.
Undefined
ST
7702/7703 Group User’s Manual
D
0
7.4 Clock asynchronous serial I/O (UART) mode
D
1
D
6
D
7
SP
Data A
ST
D
0
Data A error flag
Error flag reading
D
1
(No error )
SERIAL I/O
D
7
Data reading
Data B reading
SP
Data B
7–53