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TMP92CM22
2007-02-16
92CM22-165
(2) Mode 1 (7-bit UART mode)
7-bit UART mode is selected by setting serial channel mode register
SC0MOD0<SM1:0> to 01.
In this mode, a parity bit can be added. Use of a parity bit is enabled or disabled by
the setting of the serial channel control register SC0CR<PE> bit; whether even parity
or odd parity will be used is determined by the SC0CR<EVEN> setting when
SC0CR<PE> is set to 1 (Enabled).
Example: When transmitting data of the following format, the control registers should be
set as described below. This explanation applies to channel 0.
Transfer direction (Transfer speed 2400 bps at f
C
= 39.3216 MHz)
* Clock state: Clock gear 1/1(fc)
7 6 5 4 3 210
PFCR ← − − − − − − − 1
PFFC ← − − − − − − − 1
Set PF0 to as TXD0 pin.
SC0MOD ← X 0 − X 0 101 Set to 7-bit UART mode.
SC0CR ← X 1 1 X X X 0 0 Add even parity.
BR0CR ← 0 0 1 0 1 000 Set to 2400 bps.
INTES0 ← 1 1 0 0 − − − − Set INTTX0 interrupt to enable, set to level 4.
SC0BUF ← ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ Set transmission data.
X : Don’t care, − : No change
(3) Mode 2 (8-bit UART mode)
8-bit UART mode is selected by setting SC0MOD0<SM1:0> to 10. In this mode, a
parity bit can be added (Use of a parity bit is enabled or disabled by the setting of
SC0CR<PE>); whether even parity or odd parity will be used is determined by the
SC0CR<EVEN> setting when SC0CR<PE> is set to 1 (Enabled).
Example: When receiving data of the following format, the control registers should be set
as described below.
* Clock state: Clock gear 1/1(fc)
Main routine
7 6 5 4 3 210
PFCR ← − − − − − − 0 − Set PF1 (RXD0) to input pin.
SC0MOD ← − 0 1 X 1 001 Set to 8-bit UART mode, set receives to enable.
SC0CR ← X 0 1 X X X 0 0 Add odd parity.
BR0CR ← 0 0 0 1 1 000 Set to 9600 bps.
INTES0 ← − − − − 1 100 Set INTTX0 interrupt to enable, set to level 4.
Interrupt routine processing
Acc ← SC0CR AND 00011100
if Acc ≠
0 then ERROR
Check for error.
Acc ← SC0BUF Read receiving data.
X : Don’t care, − : No change
Stop
Even
parity
654321Bit0 Start
Start Bit0 1 23456
Transfer direction (Transfer speed 9600 bps at f
C
=
39.3216 MHz)
Odd
parity
Stop 7