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Rev. 1.0, 07/01, page 159 of 372
12.3.5 Timer I/O Control Register 0(TIOR0)
TIOR0 selects the functions of GRA and GRB, and specifies the functions of the FTIOA and
FTIOB pins.
Bit Bit Name Initial Value R/W Description
7 − 1 − Reserved
This bit is always read as 1 and cannot be modified.
6 IOB2 0 R/W I/O Control B2
Selects the GRB function.
0: GRB functions as an output compare register
1: GRB functions as an input capture register
5
4
IOB1
IOB0
0
0
R/W
R/W
I/O Control B1 and B0
When IOB2=0,
00: No output at compare match
01: 0 output to the FTIOB pin at GRB compare match
10: 1 output to the FTIOB pin at GRB compare match
11: output toggles to the FTIOB pin at GRB compare match
When IOB2=1,
00: Input capture at rising edge at the FTIOB pin
01: Input capture at falling edge at the FTIOB pin
1X: Input capture at rising edge and falling edge at the
FTIOB pin
3 − 1 − Reserved
This bit is always read as 1 and cannot be modified.
2 IOA2 0 R/W I/O Control A2
Selects the GRA function.
0: GRA functions as an output compare register
1: GRA functions as an input capture register
1
0
IOA1
IOA0
0
0
R/W
R/W
I/O Control A1 and A0
When IOA2=0,
00: No output at compare match
01: 0 output to the FTIOA pin at GRA compare match
10: 1 output to the FTIOA pin at GRA compare match
11: Output toggles to the FTIOA pin at GRA compare
match
When IOA2=1,
00: Input capture at rising edge of the FTIOA pin
01: Input capture at falling edge of the FTIOA pin
1X: Input capture at rising edge and falling edge of the
FTIOA pin
Legend X: Don't care.