Appendix 3
Appendix
3-2
32180 Group User's Manual (Rev. 1.0)
PROCESSING OF UNUSED PINS
Appendix 3.1 Example Processing of Unused Pins
An example of how to process the unused pins of the microcomputer is shown below.
(1) When operating in single-chip mode
Table 3.1.1 Example Processing of Unused Pins during Single-Chip Mode (Note 1)
Appendix 3.1 Example Processing of Unused Pins
Pin Name
P61–P63, P65–P67,
P74–P77, P82–P87, P93–P97,
P100–P107, P110–P117, P124–P127,
P130–P137, P140–P147, P150–P157,
P160–P167, P172–P177, P180–P187,
P190–P197, P200–P203, P210–P217,
P220–P223
Processing
Set the port for input mode and pull each pin low to VSS or
pull high to VCCE via a 1 k
Ω
-10 k
Ω
resistor.
Or set the port for output mode and leave the pin open.
XOUT (Note 4)
AD0IN0–AD0IN15, AD1IN0–AD1IN15,
AVREF0, AVREF1, AVSS0, AVSS1
Leave open
Connect to VCCE
AVCC0, AVCC1
JTAG
JTDO, JTMS, JTDI, JTCK
JTRST
Pull high to VCCE or low to VSS via a 0-100 k
Ω
resistor
Pull low to VSS via a 0-100 k
Ω
resistor
Connect to VSS
A-D converter
Note 1: Process the unused pins in the shortest wiring length possible (within 20 mm) from the microcomputer pins.
Note 2: If any port is set for output mode and left open, care should be taken because the port remains set for input
before it is changed for output in a program after being reset. Therefore, the voltage level at the pin is instable,
and the power supply current tends to increase while the port remains set for input. Because it is possible that
the content of the port direction register will inadvertently be altered by noise or noise-induced runaway,
higher reliability may be obtained by periodically setting the port direction register back again in a program.
Note, however, that P221 and P223 are input-only ports and do not work as an output port.
Note 3: Make sure that unintended falling edges due to noise, etc. will be not applied. (A falling edge at the SBI# input
causes a system break interrupt to occur.)
Note 4: This is necessary when an external clock is connected to XIN.
SBI# (Note 3)
Pull low to VSS via a 1 k
Ω
-10 k
Ω
resistor.
Input/output ports (Note 2)
P00–P07, P10–P17, P20–P27,
P30–P37, P41–P47, P70–P73,
P224–P227
Set the port for input mode and pull each pin low to VSS or
pull high to VCC-BUS via a 1 k
Ω
-10 k
Ω
resistor.
Or set the port for output mode and leave the pin open.
Содержание M32R/ECU Series
Страница 17: ...12 This page is blank for reasons of layout...
Страница 18: ...CHAPTER 1 OVERVIEW 1 1 Outline of the 32180 Group 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Assignments...
Страница 712: ...CHAPTER 18 OSCILLATOR CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit...
Страница 794: ...CHAPTER 22 TYPICAL CHARACTERISTICS...
Страница 795: ...22 22 2 32180 Group User s Manual Rev 1 0 TYPICAL CHARACTERISTICS To be written at a later time...
Страница 796: ...APPENDIX 1 MECHANICAL SPECIFICAITONS Appendix 1 1 Dimensional Outline Drawing...
Страница 798: ...APPENDIX 2 INSTRUCTION PROCESSING TIME Appendix 2 1 32180 Instruction Processing Time...
Страница 802: ...APPENDIX 3 PROCESSING OF UNUSED PINS Appendix 3 1 Example Processing of Unused Pins...