Computer Hardware User's Manual

TMP92CM22
2007-02-16
92CM22-164
3. Transmission and receiving (Full duplex mode)
When the full duplex mode is used, set the level of receive interrupt to “0” and
set enable the interrupt level (1 to 6) to the transfer interrupts. In the transfer
interrupt program, the receiving operation should be done like the below example
before setting the next transfer data.
Example: Channel 0, SCLK output
Baud rate = 9600 bps
f
C
= 4.9152 MHz
* Clock state: Clock gear 1/1(fc)
Main routine
7 6 5 4 3 2 1 0
INTES0 0 0 0 1 0 0 0 0 Set transmission interrupt level to 1, and disable receiving
interrupt level to 0.
PFCR − − − − − 1 0 1 Set to PF0 (TXD0), PF1 (RXD0), and PF2 (SCLK0).
PFFC − − − − − 1 −
1
SC0MOD0 0 0 0 0 0 0 0 0 Set to I/O interface mode.
SC0MOD1 1 1 0 0 0 0 0 0 Set to full duplex mode.
SC0CR 0 0 0 0 0 0 0 0 Output SCLK, select rising edge.
BR0CR 0 0 0 1 1 0 0 0 Set to 9600 bps.
SC0MOD0 0 0 1 0 0 0 0 0 Set receive to enable.
SC0BUF ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ Set transmission data.
Transmission interrupt routine
Acc SC0BUF Read receiving data.
SC0BUF ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ Set transmission data.
X: Don’t care, −: No change