TMP92CZ26A

92CZ26A-335

c. Transmission and Receiving (Full Duplex Mod e )

When Full Dupl ex M ode i s used, set th e Rec eive Interrupt L evel to 0 and s et enable

the level of transmit interrupt(1 to 6). Ensure that the program which transmits the

interrupt reads the receiving buffer before setting the next tran smit data.

The followin g is an example of this:

Example: Channel 0, SCLK output

Baud rate = 9600 bps

fsys = 2.4576 MHz

Main routine
7 6543210
INTES0 X 0 0 1 X 0 0 0 Set the INTTX0 level to 1.
Set the INTRX0 level to 0.
P9CR X X
X
X
X
101
P9FC
− −
X
X
X
1X1
Set P90, P91 and P92 to function as the TXD0,
RXD0 and SCLK0 pins respectively.
SC0MOD0
− −−−00− − Select I/O interface mode.
SC0MOD1 − 1X
X
X
X
X
X
Select full duplex mode.
SC0CR − −−−−−0 0 SCLK0 output mode, select rising edge
BR0CR 0 0 0 1 1 0 0 0 Baud rate = 9600 bps.
SC0MOD0 − −1− − − − − Enable receiving.
SC0BUF * ******* Set the transmit data and start.
INTTX0 interrupt routine
ACC ←
SC0BUF Read the receiving buffer.
SC0BUF
* ******* Set the next transmit data.
X: Don't care, −: No change