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12
12.2.3 SIO Transmit Control Registers
SIO0 Transmit Control Register (S0TCNT)
SIO1 Transmit Control Register (S1TCNT)
SIO2 Transmit Control Register (S2TCNT)
SIO3 Transmit Control Register (S3TCNT)
SIO4 Transmit Control Register (S4TCNT)
SIO5 Transmit Control Register (S5TCNT)
D0
D
Bit Name
0 , 1
No functions assigned
2 , 3
CDIV
(BRG count source select bit)
4
No functions assigned
5
TSTAT
(Transmit status bit)
6
TBE
(Transmit buffer empty bit)
7
TEN
(Transmit enable bit)
1
2
3
CDIV
Function
D2 D3
0
0 : Selects f(BCLK)
0
1 : Selects divided-by-8 f(BCLK)
1
0 : Selects divided-by-32 f(BCLK)
1
1 : Selects divided-by-256 f(BCLK)
0 : Transmit halted & no data
in transmit buffer register
1 : Transmit in progress or data exists
in transmit buffer register
0 : Data exists in transmit buffer register
1 : No data in transmit buffer register
0 : Disables transmit
1 : Enables transmit
12-16
12.2 Serial I/O Related Registers
<Address: H'0080 0110>
<Address: H'0080 0120>
<Address: H'0080 0130>
<Address: H'0080 0140>
<Address: H'0080 0A10>
<Address: H'0080 0A20>
4
5
6
TSTAT
TBE
SERIAL I/O
D7
TEN
<When reset : H'12>
R
W
0
—
0
—
—
—
Ver.0.10
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