R-IN32M3 Datasheet, PDF (67/116 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

R-IN32M3 Series Data Sheet
3. Specifications
3.21 Port Functions
3.21.1 Features
- 96 I/O ports
- Shared with I/O ports of other peripheral circuits
- Ports can be designated as input or output on 1-bit basis
Cautions 1: Switching from a signal for a peripheral module that is multiplexed with a port pin to port
mode might lead to a spike, depending on the state of the pin at the time.
The following general countermeasure for spikes should therefore be implemented in
software.
 Switch the pin function while the peripheral function is stopped.
 If the multiplexed pin function in use is an interrupt signal, clear the interrupt request
flag and then remove masking of the interrupt.
 Only switch the mode after the output value is fixed.
2: Do not externally apply an intermediate voltage to input buffers because these buffers do
not implement through-current countermeasures.
3.21.2 Port Configuration
The R-IN32M3-EC incorporates eight 3-state I/O ports and four real-time control ports. Input or output mode can be
specified for ports in 1-bit units. The basic structure of ports is the 8-bit unit, but ports P0x-P3x, P4x-P7x, and
RP0x-RP3x (x = 0-7) can also be grouped to enable reading and writing in 32-bit units. The real-time port pins (RP00 to
RP37) can be used for input and output in synchronization with interrupt signals.
Each port allows access in 8-, 16-, or 32-bit access depending on the setting of the corresponding register.
R18DS0008EJ0401
Feb 28, 2017
Page 67 of 110