m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 298

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 11.4.5 Write operation of data after transmission start
UART0 transmit/receive control register 1 (Address 35
UART1 transmit/receive control register 1 (Address 3D
UART2 transmit/receive control register 1 (Address B5
Checking state of UARTi transmit buffer register
b7
Writing of next transmit data
UART0 transmit buffer register (Addresses 33
UART1 transmit buffer register (Addresses 3B
UART2 transmit buffer register (Addresses B3
b15
[When not using interrupts]
b0
1
Transmit buffer empty flag
0: Data is present in transmit buffer register.
1: No data is present in transmit buffer register.
(Writing of next transmit data is possible.)
b0
b8
b7
Transmit data is set.
7905 Group User’s Manual Rev.1.0
11.4 Clock asynchronous serial I/O (UART) mode
16
16
16
, 32
, 3A
, B2
16
16
16
16
16
16
)
)
)
b0
)
)
)
Note:
This figure shows the bits and registers
required for processing.
See Figures 11.4.7 to 11.4.9 for the change
of flag state and the occurrence timing of an
interrupt request.
A UARTi transmit interrupt request occurs
when the transmission starts. (when the
UARTi transmit buffer register becomes
empty.)
[When using interrupts]
UARTi transmit interrupt
SERIAL I/O
11-43