Pins - Fujitsu 8FX Hardware Manual

CHAPTER 22 UART/SIO

22.4 Pins

22.4 Pins
This section describes the pins of the UART/SIO.
■ Pins of UART/SIO
The pins of UART/SIO are the clock input and output pin (UCKn), serial data output pin
(UOn) and serial data input pin (UIn).
● UCKn
Clock input/output pin for UART/SIO.
When the clock output is enabled (SMC2n:SCKE=1), it serves as a UART/SIO clock output
pin (UCKn) regardless of the value of the corresponding port direction register. At this time, do
not select the external clock (set SMC1n:CKS = 0).
When it is to be used as a UART/SIO clock input pin, disable the clock output
(SMC2n:SCKE = 0) and make sure that it is set as input port by the corresponding port
direction register. At this time, be sure to select the external clock (set SMC1n:CKS = 0).
● UOn
Serial data output pin for UART/SIO. When the serial data output is enabled (SMC2n:TXOE =
1), it serves as a UART/SIO serial data output pin (UOn) regardless of the value of the
corresponding port direction register.
● UIn
Serial data input pin for UART/SIO. When it is to be used as a UART/SIO serial data input
pin, make sure that it is set as input port by the corresponding port direction register.
460 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E