Note On Using Analog Functions; Note On Pb1 Pin Input Level - Renesas RX100 Series User Manual

RX13T Group
Table 18.10 Register Settings
Item PMR.Bn
After a reset 0
General input 0
ports
General output 0
ports
Peripheral 1
functions
Interrupt inputs 0
NMI x
Analog inputs 0* 2
x: Setting not required.
0/1: Setting the PmnPFS.ISEL bit to 0 makes the pin incapable of functioning as an IRQ pin.
Setting the PmnPFS.ISEL bit to 1 makes the pin capable of functioning as an IRQ pin (if the IRQ is selected from the multiplexed
functions).
Note: - The pin state is readable when the PmnPFS.ASEL bit is 0.
- If the value of the PmnPFS.PSEL[4:0] bits is to be changed, do so while the PMR.Bn bit is 0.
- If an RIIC function is assigned to a port pin, clear the PCR.Bn (to 0); pulling up is automatically turned off for outputs from
peripheral modules other than the RIIC.
Note 1. The pin does not function as the IRQn input pin even if the PmnPFS.ISEL bit is set to 1.
Note 2. Setting PORT4 is not required.
18.3.3

Note on Using Analog Functions

When an analog function is in use, configure the pin as a general-purpose input by setting the given bits of the port mode
register (PMR) and of the port direction register (PDR) to 0, and then set the ASEL bit in the Pmn pin function control
register (PmnPFS) to 1.
18.3.4

Note on PB1 Pin Input Level

PB1 input level is specified to TTL when SCL is selected in the PB1PFS.PSEL bit and SMBus is selected in the
ICMR3.SMBS bit in RIIC. At this time, input levels of the PB1 port read and the IRQ2 also become TTL.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
PmnPFS
PDR.Bn ASEL ISEL PSEL[4:0]
0 0 0 00000b
0 0 0/1
1 0 0
x 0 0/1 Peripheral
functions (see
Table 18.2 to
Table 18.9)
0 0 1
x x x
0 1 x* 1
18. Multi-Function Pin Controller (MPC)
Point to Note
Pins function as general input port pins after release from the reset state.
x Set the ISEL bit to 1 if these are multiplexed with interrupt inputs.
x
Set the ISEL bit to 1 if these are multiplexed with interrupt inputs.
x
x Register settings are not required.
x Set these as general input port pins so that the output buffers are turned off.
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