M16C6K7 Datasheet, PDF (102/285 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Rev.1.0
SCelorciakl _{sI/yOnchronous serial I/O mode}
Mitsubishi microcomputers
M16C / 6K7 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(1) Clock synchronous serial I/O mode
The clock synchronous serial I/O mode uses a transfer clock to transmit and receive data. Tables.GA-2 and
GA-3 list the specifications of the clock synchronous serial I/O mode. Fig.GA-9 shows the UARTi transmit/
receive mode register.
Table.GA-2 Specifications of clock synchronous serial I/O mode (1)
Item
Transfer data format
Transfer clock
Transmission/reception control
Transmission start condition
Reception start condition
Interrupt request
generation timing
Error detection
Specification
• Transfer data length: 8 bits
• When internal clock is selected (bit 3 at addresses 03A016, 03A816, 037816
= “0”) : fi/ 2(n+1) (Note 1) fi = f1, f8, f32
• When external clock is selected (bit 3 at addresses 03A016, 03A816, 037816
= “1”) : Input from CLKi pin
_______
_______
_______ _______
• Selecting from CTS function/RTS function/Disable CTS, RTS function
• To start transmission, the following requirements must be met:
_ _{Transmit enable bit (bit 0 at addresses 03A516, 03AD16, 037D16) = “1”}
_ _{Transmit buffer empty flag (bit 1 at addresses 03A516, 03AD16, 037D16) = “0”}
_______
_______
_ _{When CTS function selected, CTS input level = “L”}
• Furthermore, if external clock is selected, the following requirements must also be met:
_ _{CLKi polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16) = “0”:}
CLKi input level = “H”
_ _{CLKi polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16) = “1”:}
CLKi input level = “L”
• To start reception, the following requirements must be met:
_ _{Receive enable bit (bit 2 at addresses 03A516, 03AD16, 037D16) = “1”}
_ _{Transmit enable bit (bit 0 at addresses 03A516, 03AD16, 037D16) = “1”}
_ _{Transmit buffer empty flag (bit 1 at addresses 03A516, 03AD16, 037D16) = “0”}
• Furthermore, if external clock is selected, the following requirements must
also be met:
_ _{CLKi polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16) = “0”:}
CLKi input level = “H”
_ _{CLKi polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16) = “1”:}
CLKi input level = “L”
• When transmitting
_ _{Transmit interrupt factor selection bits (bits 0, 1 at address 03B016, bit 4 at}
address 037D16) = “0”: At the completion of data transmission from UARTi
transfer buffer register to UARTi transmit register
_ _{Transmit interrupt factor selection bits (bits 0, 1 at address 03B016, bit 4 at}
address 037D16) = “1”: At the completion of data transmission from
UARTi transfer register is completed
• When receiving
_ _{At the completion of data transferring from UARTi receive register to}
UARTi receive buffer register
• Overrun error (Note 2)
This error occurs when the next data is ready before contents of UARTi
receive buffer register are read out
Note 1: “n” denotes the value 0016 to FF16 that is set to the UART bit rate generator.
Note 2: If an overrun error occurs, the UARTi receive buffer will have the next data written in. Note also that
the UARTi receive interrupt request bit is not set to “1”.
101