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MB91F155 Datasheet(PDF) 39 Page - fujitsu semiconductor

Part # MB91F155
Description  32-bit Proprietary Microcontrollers
PDF  104 Pages
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Manufacturer  FUJITSU [fujitsu semiconductor]
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Logo FUJITSU - fujitsu semiconductor

MB91F155 Datasheet(HTML) 39 Page - fujitsu semiconductor

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MB91F155/MB91154
39
• I/O Port (attached with the open drain output function and a pullup resistor)
Figure PORT-3 Port block attached with the open drain output function and a pullup resistor
Notes :
• Pullup resistor setup register (PCR) R/W
Controls turning the pullup resistor on/off.
0 : Pullup resistor disabled
1 : Pullup resistor enabled
• Open drain control register (ODCR) R/W
Controls open drain in output mode.
0 : Standard output port during output mode
1 : Open-drain output port during output mode
This register has no significance in input mode (output Hi-Z) . Input/output mode is determined by the direction
register (DDR) .
• Priority is also given to the setting of the pullup resistor control register in stop mode.
• When a relevant pin is used as an external bus pin, neither function is available. Do not write “1” to either register.
Data bus
PDR read
0
1
0
1
pin
Resource input
Resource output
Resource output
allowed
PDR
DDR
ODCR
PCR
PDR
DDR
ODCR
PCR
: Port Data Register
: Data Direction Register
: OpenDrain Control Register
: Pull-up Control Register



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