Operation In Asynchronous Mode (Operation Mode 0 Or Operation Mode1) - Fujitsu MB90335 Series Hardware Manual

CHAPTER 18 UART
18.7 Explanation of Operation of UART
18.7.1 Operation in Asynchronous Mode (Operation Mode 0 or
Operation Mode1)
The UART uses asynchronous transfer when used in operation mode 0 (normal mode)
or operation mode 1 (multiprocessor mode).
■ Operation in Asynchronous Mode
●
Format of transmit/receive data
Sending and receiving always start with the start bit ("L" Level), specified data bit length is sent and
received, and end with the stop bit ("H" 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 (SCR0,
SCR1:A/D) is added as bit9.
Figure 18.7-1 shows the data formats for sending and receiving in the asynchronous mode.
Figure 18.7-1 Data Format for Sending and Receiving (Operation Mode 0 and 1)
[Operation mode 0]
ST D0
ST D0
ST D0
ST D0
ST D0
ST D0
ST D0
ST D0
[Operation mode 1]
ST D0
ST
: Start bit
ST
SP : Stop bit
P : Parity bit
: Address/Data bit
A/D
416
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D1 D2 D3 D4
D0 D1 D2 D3 D4
FUJITSU MICROELECTRONICS LIMITED
D5 D6 D7 SP SP
D5 D6 D7 SP
D5 D6 D7 P SP SP
D5 D6 D7 P SP
D5 D6 SP SP
D5 D6 SP
D5 D6 P SP SP
D5 D6 P SP
D5 D6 D7 A/D SP SP
D5 D6 D7 A/D SP
MB90335 Series
No P
Data 8 bits
with P
No P
Data 7 bits
with P
Data 8 bits
CM44-10137-6E