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Chapter 2
50
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2.2.5 Alternative input selection
Alternative input functions of CSIB0, UART0, UART1, I
provided on two pins each. Thus you can select on which pin the alternative
function should appear. For this purpose, four peripheral function select
registers PFSRk (k = 0, 3) are provided.
Note
The selection of the alternative input function is done by a different circuit than
the selection of the alternative output function. Therefore, the registers for
selecting the alternative input functions (PFSR) are not reflected in the block
diagrams of the port types in chapter "Port Types Diagrams" on page 52.
(1)
PFSR0 - Peripheral function select register
The 8-bit PFSR0 register selects the alternative input paths for the peripheral
functions CSIB0, I
Access
This register can be read/written in 8-bit units.
Address
FFFF F720
H
Initial Value
01
. This register is initialized by any reset.
H
7
6
a
0
0
R/W
R/W
a)
These bits must not be changed!
Table 2-16
PFSR0 register contents
Bit position
5
4
0
Preliminary User's Manual U17566EE1V2UM00
2
2
C0 and I
C1.
5
4
3
a
a
PFSR05 PFSR04
0
R/W
R/W
R/W
Bit name
Specifies the alternative input path for I
0: SCL1 is input from P21 (SCL1_0)
PFSR05
SDA1 is input from P20 (SDA1_0)
1: SCL1 is input from P31 (SCL1_1)
SDA1 is input from P30 (SDA1_1)
Specifies the alternative input path for I
0: SCL0 is input from P17 (SCL0_0)
PFSR04
SDA0 is input from P16 (SDA0_0)
1: SCL0 is input from P64 (SCL0_1)
SDA0 is input from P65 (SDA0_1)
Specifies the alternative input path for CSIB0:
0: SCKB0 is input from P42 (SCKB0_0)
PFSR00
SIB0 is input from P40 (SIB0_0)
1: SCKB0 is input from P107 (SCKB0_1)
SIB0 is input from P105 (SIB0_1)
Pin Functions
2
2
C0 and I
C1 are
2
1
0
a
a
0
0
PFSR00
R/W
R/W
R/W
Function
2
C1:
2
C0:
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