m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 64

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.4 Clock-Asynchronous Serial I/O (UART)
Figure 2.4.1. Transmission/reception format
Table 2.4.1. Transmission data names and functions
2.4.1 Overview
DATA (character bits)
ST (start bit)
SP (stop bit)
PAR (parity bit)
UART handles communications by means of character-by-character synchronization. The transmission
side and the reception side are independent of each other, so full-duplex communication is possible. The
following is an overview of the clock-asynchronous serial I/O.
(1) Transmission/reception format
Figure 2.4.1 shows the transmission/reception format, and Table 2.4.1 shows the names and func-
tions of transmission data.
Name
Transfer data length : 7 bits
Transfer data length : 8 bits
Transfer data length : 9 bits
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Either 1-bit or 2-bit “H” signal to be added immediately after character bits (after
the parity bit if parity is checked). This / they signals the end of data
transmission.
A 1-bit “L” signal to be added immediately before character bits.
This bit signals the start of data transmission.
Transmission data set in the UARTi transmit buffer register.
A signal to be added immediately after character bits so as to increase data
reliability. The level of this signal so varies that the total number of 1's in
character bits and this bit always becomes even or odd depending on which
parity is chosen, even or odd.
1ST – 7DATA
1ST – 7DATA
1ST – 7DATA – 1PAR – 1SP
1ST – 7DATA – 1PAR – 2SP
1ST – 8DATA
1ST – 8DATA
1ST – 8DATA – 1PAR – 1SP
1ST – 8DATA – 1PAR – 2SP
1ST – 9DATA
1ST – 9DATA
1ST – 9DATA – 1PAR – 1SP
1ST – 9DATA – 1PAR – 2SP
ST
DATA : Character bit (Transfer data)
PAR
SP
: Start bit
: Parity bit
: Stop bit
Function
1SP
2SP
1SP
2SP
1SP
2SP
2. UART