R-IN32M3_15 Datasheet, PDF (67/105 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

R-IN32M3 Series Data Sheet
3. Specifications
3.21 Port Functions
The ports RP0 - RP3 provide dedicated interfaces to the AHB bus separate from other ports and enables, allowing for
real-time 32-bit data transmission.
For each register, grouping into 8, 16, or 32 bit-access is supported.
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 a1-bit basis
Caution1. When changing the Port Mode Control (PMCTn) registers, shared signals may generate
spike noise.
Therefore, please take the following general spike noise countermeasures via software:
- Change signals only after stopping operation of the related internal peripheral circuits
- Release the mask after clearing the interrupt request flag in ports shared with interrupt
signals
- Change mode after setting the output value.
Caution2. Please do not supply intermediate voltage from external sources because input buffers are
not protected against input through current. Make sure inputs are “full-rail” 0 or 1.
3.21.2 Configuration
There are 8 ports of 3 state I/O port and 4 ports controlling in real time built-in. Input and output configuration is
possible to 1 bit unit. The port is a basic 8 bits unit, but can read / write by the 32bit unit that aligned P0x - P3x, P4x -
P7x, RP0x - RP3x. ( x = 0 to 7) In addition, real-time port (RP0x - RP3x) can input and output in sync with interrupt.
For each register, grouping into 8, 16, or 32 bit-access is supported.
R18DS0008EJ0204
Dec 25, 2014
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