Fujitsu mb91192 Manuale Utente

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The serial I/O has two modes, namely, transmission mode and transmission/reception mode. In the case of

transmission mode (DIR=1), contents transferred to the P.S conversion buffer from the data RAM area are

synchronized to the falling of the external clock or serial shift clock (SCK) generated internally and output

to the serial output pin (SO) bit serially. In the case of transmission reception mode (DIR=0), contents

transferred to the P.S conversion buffer from the data RAM area are synchronized to the falling of the

external clock or serial shift clock (SCK) generated internally, output to the serial output pin (SO) bit

serially, also retrieved into the P.S conversion buffer at the rising of the serial shift clock (SCK) bit serially

from the serial input pin (SI), and transferred to the data RAM when 8-bit transfer ends.

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Transmission/reception mode 

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Transmission mode

Data RAM region

#7

#6

#5

#4

#3

#2

#1

#0

P

S Convert

SCK

SI

SO

SI

SO

SCK

SI

O

C K

#0

#1

#2

#5

#6

#7

#7

#6

#5

#4

#3

#2

#1

#0

P

S Convert

SCK

SO

SO

SCK

C K

C K

#0

#1

#2

#5

#6

#7

O

Data RAM region