Cypress MB95710M Series - Port G

MB95710M Series
MB95770M Series
Document Number: 002-09307 Rev. *D Page 121 of 172
19.10.4 Port F operations
• Operation as an output port
• A pin becomes an output port if the bit in the DDRF 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 PDRF register to external pins.
• If data is written to the PDRF 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 PDRF register returns the PDRF register value.
• Operation as an input port
• A pin becomes an input port if the bit in the DDRF 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 PDRF register, the value is stored in the output latch but is not output to the pin set as an
input port.
• Reading the PDRF register returns the pin value. However, if the read-modify-write (RMW) type of instruction is
used to read the PDRF register, the PDRF register value is returned.
• Operation at reset
If the CPU is reset, all bits in the DDRF 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 DDRF 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.
19.11 Port G
Port G is a general-purpose I/O port. This section focuses on its functions as a general-purpose I/O port. For details of
peripheral functions, refer to their respective chapters in “New 8FX MB95710M/770M Series Hardware Manual”.
19.11.1 Port G configuration
Port G is made up of the following elements.
• General-purpose I/O pins/peripheral function I/O pins
• Port G data register (PDRG)
• Port G direction register (DDRG)
• Port G pull-up register (PULG)
19.11.2 Block diagram of port G
• PG1/X0A pin
This pin has the following peripheral function:
• Subclock input oscillation pin (X0A)
• PG2/X1A pin
This pin has the following peripheral function:
• Subclock I/O oscillation pin (X1A)