MB95710M Series
MB95770M Series
Document Number: 002-09307 Rev. *D
Page 105 of 172
19.4.4 Port 6 operations
• Operation as an output port
• A pin becomes an output port if the bit in the DDR6 register corresponding to that pin is set to “1”.
• For a pin shared with other peripheral functions, disable the output of such peripheral functions.
• When a pin is used as an output port, it outputs the value of the PDR6 register to external pins.
• If data is written to the PDR6 register, the value is stored in the output latch and is output to the pin set as an output
port as it is.
• Reading the PDR6 register returns the PDR6 register value.
• To use a pin shared with the LCDC as an output port, set a corresponding function select bit in the LCDC enable
register 3 (LCDCE3:SEG[07:06]) or in the LCDC enable register 4 (LCDCE4:SEG[13:08]) to “0” to select the gen-
eral-purpose I/O port function, and then set the port input control bit in the LCDC enable register 1 (LC-
DCE1:PICTL) to “1”.
• Operation as an input port
• A pin becomes an input port if the bit in the DDR6 register corresponding to that pin is set to “0”.
• For a pin shared with other peripheral functions, disable the output of such peripheral functions.
• If data is written to the PDR6 register, the value is stored in the output latch but is not output to the pin set as an
input port.
• Reading the PDR6 register returns the pin value. However, if the read-modify-write (RMW) type of instruction is
used to read the PDR6 register, the PDR6 register value is returned.
• To use a pin shared with the LCDC as an input port, set a corresponding function select bit in the LCDC enable
register 3 (LCDCE3:SEG[07:06]) or in the LCDC enable register 4 (LCDCE4:SEG[13:08]) to “0” to select the gen-
eral-purpose I/O port function, and then set the PICTL bit in the LCDCE1 register to “1”.
• Operation as an LCDC segment output pin
• Set the bit in the DDR6 register corresponding to an LCDC segment output pin to “0”.
• To use a pin shared with a general-purpose I/O port as an LCDC segment output pin, set a corresponding function
select bit in the LCDC enable register 3 (LCDCE3:SEG[07:06]) or in the LCDC enable register 4 (LC-
DCE4:SEG[13:08]) to “1” to select the LCDC segment output function, and then set the PICTL bit in the LCDCE1
register to “1”.
• Operation at reset
If the CPU is reset, all bits in the DDR6 register are initialized to “0” and port input is enabled.
• Operation in stop mode and watch mode
• If the pin state setting bit in the standby control register (STBC:SPL) is set to “1” and the device transits to stop
mode or watch mode, the pin is compulsorily made to enter the high impedance state regardless of the DDR6 reg-
ister value. The input of that pin is locked to “L” level and blocked in order to prevent leaks due to input open.
• If the pin state setting bit is “0”, the state of the port I/O or that of the peripheral function I/O remains unchanged
and the output level is maintained.
