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Chapter 2
Pin Functions
Preliminary User’s Manual U17566EE1V2UM00
2.4.7
Port group 3
Port group 3 is an 8-bit port group. In alternative mode, it comprises pins for
the following functions:
• UARTA0 transmit/receive data (TXDA0, RXDA0)
• UARTA1 transmit/receive data (TXDA1, RXDA1)
• I
2
C1 data/clock line (SDA1, SCL1)
• LCD controller segment signal output (SEG8 to SEG11, SEG29, SEG31)
(µPD70(F)3420, µPD70(F)3421, µPD70(F)3422, µPD70F3423 only)
• Timer TMG2 channels (TIG21 to TIG24, TOG21 to TOG24)
• Timer TMP0 to TMP3 channels (TOP01 to TOP31) (µPD70F3424,
µPD70F3425, µPD70F3426, µPD70F3427 only)
Port group 3 includes the following pins:
x
Note
1.
For pins that support only one alternative output mode, the PFCnm bit is
not available.
2.
Alternative
input
functions of I
2
C1 (SDA1, SCL1) are provided on two pins
each. Thus you can select on which pin the alternative function should
appear. If alternative functions SDA1/SCL1 are used at P30/31 make sure
to set also PFSR0.PFSR05 = 1.
Refer to
“Alternative input selection“ on page 50
.
Table 2-28
Port group 3: pin functions and port types
Pin functions in different modes
Pin function
after reset
Port type
Port mode
(PMCnm = 0)
Alternative mode
(PMCnm = 1)
LCD mode
(PLCDCnm = 1)
a
Output mode (PMnm = 0)
Input mode
(PMnm = 1)
PFCnm = 0
ALT1-OUT
PFCnm = 1
ALT2-OUT
P30 (I/O)
TXDA0
SDA1
b
SDA1
–
P30 (I)
M
P31 (I/O)
SCL1
b
RXDA0/SCL1
–
P31 (I)
M
P32 (I/O)
TXDA1
–
SEG31
a
P32 (I)
M
P33 (I/O)
–
RXDA1
SEG29
a
P33 (I)
M
P34 (I/O)
TOP01
TOG21
–
SEG8
a
P34 (I)
M
P35 (I/O)
TOP21
TOG22
TIG22
SEG9
a
P35 (I)
M
P36 (I/O)
TOP31
TOG23
TIG23
SEG10
a
P36 (I)
M
P37 (I/O)
TOP11
TOG24
TIG24
SEG11
a
P37 (I)
M
a)
µPD70(F)3420, µPD70(F)3421, µPD70(F)3422, µPD70F3423 only
b)
In I
2
C function mode open drain emulation has to be enabled (PODC3.PODC30 = 1 and
PODC3.PODC31 = 1). Thus output function is enabled automatically, although PMnm = 1.
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