SH7280 Datasheet, PDF (1301/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 23 Pin Function Controller (PFC)
23.3 Usage Notes
1. In this LSI, the same function is available as a multiplexed function on multiple pins. This
approach is intended to increase the number of selectable pin functions and to allow the easier
design of boards. Note the following points when two or more pins are specified for one
function.
• When the pin function is input
Signals input to several pins are formed as one signal through OR or AND logic and the signal
is transmitted into the LSI. Therefore, a signal that differs from the input signals may be
transmitted to the LSI depending on the input signals in other pins that have the same
functions. Table 23.19 shows the transmit forms of input functions allocated to several pins.
When using one of the functions shown below in multiple pins, use it with care of signal
polarity considering the transmit forms.
Table 23.19 Transmission Format of Input Function Allocated on Multiple Pins
OR Type
SCK0, SCK3, RXD0, RXD2, RXD3, POE0
POE4 POE8, TIOC3AS to TIOC4DS, TIC5U,
TIC5V, TIC5W, TIC5VS, TIC5WS
AND Type
IRQ0 to IRQ6, DREQ0, DREQ1, ADTRG
OR Type:
AND Type:
Signals input to several pins are formed as one signal through OR logic and the
signal is transmitted into the LSI.
Signals input to several pins are formed as one signal through AND logic and
the signal is transmitted into the LSI.
• When the pin function is output
Each selected pin can output the same function.
2. When the port input is switched from the low level to the DREQ edge or the IRQ edge for the
pins that are multiplexed with I/O and DREQ or IRQ, the corresponding edge is detected.
3. Do not set functions other than those specified in tables 23.1 to 23.16. Otherwise, correct
operation cannot be guaranteed.
Rev. 1.00 Jun. 26, 2008 Page 1271 of 1692
REJ09B0393-0100