M16C62 Datasheet, PDF (103/231 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock asynchronous serial I/O (UART) mode
Mitsubishi microcomputers
M16C / 62 Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(2) Clock asynchronous serial I/O (UART) mode
The UART mode allows transmitting and receiving data after setting the desired transfer rate and transfer
data format. Tables 1.14.5 and 1.14.6 list the specifications of the UART mode. Figure 1.14.15 shows
the UARTi transmit/receive mode register.
Table 1.14.5. Specifications of UART Mode (1)
Item
Specification
Transfer data format
• Character bit (transfer data): 7 bits, 8 bits, or 9 bits as selected
• Start bit: 1 bit
• Parity bit: Odd, even, or nothing as selected
• Stop bit: 1 bit or 2 bits as selected
Transfer clock
• When internal clock is selected (bit 3 at addresses 03A016, 03A816, 037816 = “0”)
: fi/16(n+1) (Note 1) fi = f1, f8, f32
• When external clock is selected (bit 3 at addresses 03A016, 03A816 =“1”)
: fEXT/16(n+1)(Note 1,2,4)
_______
_______
_______ _______
Transmission/reception control • CTS function/RTS function/CTS, RTS function chosen to be invalid (Note 5)
Transmission start condition • 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”
Reception start condition • To start reception, the following requirements must be met:
- Receive enable bit (bit 2 at addresses 03A516, 03AD16, 037D16) = “1”
- Start bit detection
Interrupt request
• When transmitting
generation timing
- Transmit interrupt cause select bits (bits 0,1 at address 03B016, bit4 at
address 037D16) = “0”: Interrupts requested when data transfer from UARTi
transfer buffer register to UARTi transmit register is completed
- Transmit interrupt cause select bits (bits 0, 1 at address 03B016, bit4 at
address 037D16) = “1”: Interrupts requested when data transmission from
UARTi transfer register is completed
• When receiving
- Interrupts requested when data transfer from UARTi receive register to
UARTi receive buffer register is completed
Error detection
• Overrun error (Note 3)
This error occurs when the next data is ready before contents of UARTi
receive buffer register are read out
• Framing error
This error occurs when the number of stop bits set is not detected
• Parity error
This error occurs when if parity is enabled, the number of 1’s in parity and
character bits does not match the number of 1’s set
• Error sum flag
This flag is set (= 1) when any of the overrun, framing, and parity errors is
encountered
Note 1: ‘n’ denotes the value 0016 to FF16 that is set to the UARTi bit rate generator.
Note 2: fEXT is input from the CLKi pin.
Note 3: 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”.
Note
4:
Since
CLK2 _{_________}
does
________
not
have
external
port,
external
clock cannot
_______ _______
be
selected
as
UART2
transfer
clock.
Note 5: Since CTS2/RTS2 does not have external port, select CTS/RTS function inhavit (bit 4 at 037C16 = “1”).
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