FUJITSU F2MC-8L F202RA - Manual (Page 304)

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CHAPTER 13 UART
■ Block Diagram of the UART-relating Pins
Figure 13.3-1 Block Diagram of UART-relating Pins
When use of the pull-up resistor is selected in the pull-up setting register, the pin status does not become
Hi-Z but "H" level (pull-up state) in stop mode (SPL = 1). However, the pull-up resistor is not applied
during reset; accordingly, the pin status becomes Hi-Z.
DDR
Pch
Nch
UCK
PDR
PUL
P 3 0/UCK/ S CK
P 3 2/UI/ S I UI
P 3 0/UCK/ S CK
P 3 1/UO/ S O
Pin
P 3 2/UI/ S I
Inter
n
a
l d
a
t a
bu
s
PDR re a d
PDR re a d
(At re a d-modify-write)
PDR write
DDR write
PUL re a d
PUL write
Re s o u rce o u tp u t
Re s o u rce
o u tp u t
en ab le
S top mode
( S PL = 1)
Re s o u rce
o u tp u t a llowed
P u ll- u p re s i s tor
O u tp u t
l a tch
S top mode
( S PL = 1)