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Chapter 2
Pin Functions
Preliminary User’s Manual U17566EE1V2UM00
2.4.18
Port group 14 (µPD70F3427 only)
Port group 14 is a 3-bit port group. In alternative mode, it comprises pins for
the following functions:
• External memory interface bus clock BCLK
• External memory interface byte enable signals BE2, BE3
Port group 14 includes the following pins:
Access
All 8-bit registers can be accessed in 8-bit or 1-bit units.
Table 2-50
Port group 14: pin functions and port types
Pin functions in different modes
Pin function
after reset
Port type
Port mode
(PMCnm = 0)
Alternative mode
(PMCnm = 1)
Output mode
(PMnm = 0)
Input mode
(PMnm = 1)
P140 (I/O)
BCLK
–
P140 (I)
M
P141 (I/O)
BE2
–
P141 (I)
M
P142 (I/O)
BE3
–
P142 (I)
M
Table 2-51
Port group 14: configuration registers
Register
Address
Initial
value
Used bits
PM14
FFFF F43C
H
FF
H
X
X
X
X
X
PM142
PM141
PM140
PMC14
FFFF F45C
H
00
H
X
X
X
X
PMC143
a
a)
PMC143 specifies the data bus width of the external memory interface:
- PMC143 = 0: 16-bit data bus D[15:0], D[31:16] pins of port groups 3, 8, 9, 10 operate in port/alternative mode
- PMC143 = 1: 32-bit data bus D[31:0], D[31:16] pins of port groups 3, 8, 9, 10 operate as data bus pins
PMC142
PMC141
PMC140
P14
FFFF F41C
H
00
H
X
X
X
X
X
P142
P141
P140
PPR14
FFFF F3DC
H
00
H
X
X
X
X
X
PPR142
PPR141
PPR140
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