Precautions For Programmable I/O Ports - Renesas M16C/26 Series Reference Book

Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
M16C/26 Group

1.9 Precautions for Programmable I/O Ports

1. If a low-level signal is applied to the P8
phase output forcible cutoff by input on SD pin enabled), the P7
impedance state.
2. The input threshold voltage of pins differs between programmable input/output ports and peripheral
functions.
Therefore, if any pin is shared by a programmable input/output port and a peripheral function and the
input level at this pin is outside the range of recommended operating conditions V
"high" nor "low"), the input level may be determined differently depending on which side—the program-
mable input/output port or the peripheral function—is currently selected.
3. When three phase motor control function is enabled, it becomes the following when "L" is input to the
P8 pin. When you don't want to do such a change, without using the P8
5
input "H" to the P8
•When the TB2SC register IVPCR1 bit = "1" (three-phase output forcible cutoff by input on SD pin
enabled), the U/ U/ V/ V/ W/ W pins go to a high-impedance state.
•When the TB2SC register IVPCR1 bit = "0" (three-phase output forcible cutoff by input on SD pin
disabled), the U/ U/ V/ V/ W/ W pins go to a normal port.
Rev.0.90 2003.12.28 page 21 of 28
_______ _____
/NMI/SD pin when the TB2SC register IVPCR1 bit = "1" (three-
5
_____
pin before setting PD8
5 5
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__ __ ___
1.9 Precautions for Programmable I/O Ports
to P7
2
= "L".
, P8 and P8 pins go to a high-
5 0 1
and V
IH IL
pin as a programable I/O port,
5
(neither
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