Operation In Asynchronous Mode (Operation Mode 0 Or 1) - Fujitsu MB90895 Series Hardware Manual

15.6.1 Operation in Asynchronous Mode
(Operation Mode 0 or 1)
When the UART1 is used in operation mode 0 (asynchronous normal mode) or
operation mode 1 (asynchronous multiprocessor mode), the asynchronous transfer
mode is selected.
I Operation in Asynchronous Mode
G
Format of transmit/receive data
Transmission and reception always start with the start bit (Low level); transmission and reception are
performed at the specified data bit length on LSB first basis and end with the stop bit (High level).
• In operation mode 0 (Asynchronous normal mode), the data length can be set to 7 or 8 bits.Use of the
parity bit can be specified.
• In operation mode 1 (Asynchronous multiprocessor mode), the data length is fixed to 8 bits.The address/
data bit (SCR1 register bit 11: A/D) is added to bit 9.
shows the transmit/receive data format in the asynchronous mode.
Figure 15.6-1 Format of Transmit/Receive Data (Operation Mode 0 or 1)
[Operating mode 0]
ST
ST
ST
ST
ST
ST
ST
ST
[Operating mode 1]
ST
ST
ST : Start bit
SP : Stop bit
P : Parity bit
A/D : Address/Data bit
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D0 D1 D2 D3 D4
D5 D7 D8 SP SP
D5 D7 D8 SP
D5 D7 D8 P SP SP
D5 D7 D8 P SP
D5 D7 SP SP
D5 D7 SP
D5 D7 P SP SP
D5 D7 P SP
D5 D7 D8 A/D SP SP
D5 D7 D8 A/D SP
CHAPTER 15 UART1
Without P
Data 8bit
With P
Without P
Data 7bit
With P
Data 8bit
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