Fujitsu F2MC-8FX Hardware Manual page 128

CHAPTER 9 I/O PORT
Operation in stop mode and watch mode
• If the pin state specification bit in the standby control register (STBC:SPL) is set to "1" when the device
switches to stop or watch mode, the pin is set forcibly to the high-impedance state regardless of the
DDR value. Note that the input is locked to "L" and blocked in order to prevent leaks due to freed input.
However, if the peripheral function input is enabled for the interrupt pin selection circuits (UI0, UCK0,
ADTG), the input is enabled and not blocked.
• If the pin state specification bit is "0", the state remains in port I/O or peripheral function I/O and the
output is maintained.
Operation of the pull-up register
• Writing "1" to the PUL internally connects the pull-up register to the pin. When the output is "L" level,
the pull-up register is disconnected regardless of the PUL value.
Operation of the input level selection register
• Writing "1" to the bit1 of ILSR2 changes port 1 except P10 from the hysteresis input level to the
automotive input level.When the bit 1 of ILSR2 is "0", it should be the hysteresis input level.
• The input level of P10 is determined by the bit0 of ILSR and bit1 of ILSR2.When bit0 of ILSR is "1",
ignoring the bit1 of ILSR2's value,P10 should be CMOS input level.When bit0 of ILSR is "0", if bit1 of
ILSR2 is "0",P10 should be hysteresis input level, otherwise P10 should be automotive input level.
• Make sure that the input level for P10 is changed during the peripheral function (UART/SIO) stopped.
Table 9.3-4 shows the pin states of the port.
Table 9.3-4 Pin State of Port 1
Normal operation
Operating Sleep
state Stop (SPL=0)
Watch (SPL=0)
I/O port/
Pin state
peripheral function I/O
SPL: Pin state specification bit in standby control register (STBC:SPL)
Hi-Z: High impedance
*: "Input enabled" means that the input function is enabled; it requires the pull-up or pull-down operation, or preventing
leaks by external inputs. Same as other ports when used as an output port.
114
Stop (SPL=1)
Watch (SPL=1)
Hi-Z
(the pull-up setting is enabled)
Input cutoff
At reset
Hi-Z
Input enabled*
(Not functional)