Fujitsu F2MC-8L F202RA, Hardware Manual

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85
CHAPTER 4 I/O PORTS
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Block Diagram of Port 3
Figure 4.3-1 Block Diagram of Port 3
Note:
Because the value states of the pins are always input to the external interrupt circuit, when a pin is used
as a normal I/O port, the operation of the external interrupt circuit corresponding to the pin must be
inhibited. See "CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE) ".
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Registers PDR3, DDR3, and PUL3 of Port 3
The registers PDR3, DDR3, and PUL3 are associated with port 3.
The bits of these registers correspond to the pins of port 3 in one-to-one correspondence.
Table 4.3-2 tabulates the correspondence between the pins and the bits of port 3 registers.
DDR
Pch
Nch
PDR
PUL
Inter
n
a
l d
a
t
a
bu
s
PDR re a d
PDR write
PDR re a d
(when re a d-modify-write i s
performed)
O u tp u t l a tch
DDR write
PUL re a d
PUL write
Extern a l
interr u pt
Inp u t to
peripher a l
Inp u t to
peripher a l
O u tp u t from peripher a l
O u tp u t
from
peripher a l
en ab le
S top mode
( S PL = 1)
O u tp u t occ u rring
from peripher a l
Extern a l interr u pt
en ab le
Extern a l interr u pt
occ u rring
Hy s tere s i s inp u t
CMO S inp u t
P u ll- u p re s i s tor
Pin s
S top mode
( S PL = 1)
Table 4.3-2 Correspondence between the Pins and the Bits of Port 3 Registers
Port name Bits of associated registers and corresponding pins
Port 3
PDR3, DDR3, PUL3 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
Pin corresponding to bit P37 P36 P35 P34 P33 P32 P31 P30