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

14.6.1 Operation in asynchronous mode
(operation mode 0 or 1)
When the UART0 is used in operation mode 0 (normal mode) or operation mode 1
(multiprocessor mode), the asynchronous transfer mode is selected.
I Operation in Asynchronous Mode
G
Format of transmit/receive data
Transmission and reception always begin with the start bit (Low level); transmission and reception are
performed at the specified data bit length on an LSB-first basis and end with the stop bit (High level).
• For use in operation mode 0, select a data length of seven or eight bits.You can select whether to use the
parity bit.
• In operation mode 1, the data length is fixed at 8 bits.There is no parity bit.The address/data bit (SMR0:
A/D) is added as bit 9.
Figure 14.6-1 shows the transmit/receive data format in the asynchronous mode.
Figure 14.6-1 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 14 UART0
Without P
Data 8bit
With P
Without P
Data 7bit
With P
Data 8bit
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