12
12-41
Serial I/O
12.6 Transmit Operation in UART Mode
32180 Group User's Manual (Rev.1.0)
Table 12.6.1 Transfer Data in UART Mode
Bit Name
Content
ST (start bit)
Indicates the beginning of data transmission. This is a low-level signal of a one bit
period, which is added immediately preceding the transmit data.
Bits 0–8 (character bits)
Transmit/receive data transferred via serial I/O. In UART mode, 7, 8 or 9 bits of data
can be transmitted/received.
PAR (parity bit)
Added to the transmit/receive character. When parity is enabled, parity is
automatically set in such a way that the number of 1’s in the character including the
parity bit itself is always even or odd as selected by the even/odd parity select bit.
SP (stop bit)
Indicates the end of data transmission, which is added immediately following the
character (or if parity is enabled, immediately following the parity bit). The stop bit
can be chosen to be one bit or two bits long.
Figure 12.6.2 Selectable Data Formats during UART Mode
ST
b7
b6
b5
b4
b3
b2
b1
b0
PAR
SP
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
PAR
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
SP
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
SP
LSB
MSB
8-bit character
ST
b7
b6
b5
b4
b3
b2
b1
SP
SP
PAR
ST
b7
b6
b5
b4
b3
b2
b1
SP
PAR
ST
b7
b6
b5
b4
b3
b2
b1
SP
SP
ST
b7
b6
b5
b4
b3
b2
b1
SP
LSB
MSB
7-bit character
9-bit character
ST
b7
b6
b5
b4
b3
b2
b1
b0
PAR
SP
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
PAR
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
SP
SP
ST
b7
b6
b5
b4
b3
b2
b1
b0
SP
LSB
MSB
b8
b8
b8
b8
Bits 0-7: Character (data) bits
SP: Stop bit
ST: Start bit
PAR: Parity bit
b0
b7
b8
b15
7-bit character
8-bit character
9-bit character
SIO Transmit Buffer Register
SIO Receive Buffer Register
Notes: • The high-order bits of the selected character length in the SIO Receive Buffer Register are fixed to "0".
• The data bit numbers (bn) above indicate bit numbers in a data list, and not the register bit numbers (bn).
Содержание M32R/ECU Series
Страница 17: ...12 This page is blank for reasons of layout...
Страница 18: ...CHAPTER 1 OVERVIEW 1 1 Outline of the 32180 Group 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Assignments...
Страница 712: ...CHAPTER 18 OSCILLATOR CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit...
Страница 794: ...CHAPTER 22 TYPICAL CHARACTERISTICS...
Страница 795: ...22 22 2 32180 Group User s Manual Rev 1 0 TYPICAL CHARACTERISTICS To be written at a later time...
Страница 796: ...APPENDIX 1 MECHANICAL SPECIFICAITONS Appendix 1 1 Dimensional Outline Drawing...
Страница 798: ...APPENDIX 2 INSTRUCTION PROCESSING TIME Appendix 2 1 32180 Instruction Processing Time...
Страница 802: ...APPENDIX 3 PROCESSING OF UNUSED PINS Appendix 3 1 Example Processing of Unused Pins...