8
8-4
Rev.1.0
8.2 Selecting Pin Functions
Each input/output port serves dual functions sharing the pin with other internal peripheral I/O or
extended external bus signal lines (or triple functions sharing the pin with two or more functions of
peripheral I/O). Pin functions are selected depending on the operation modes set or by using the
input/output port operation mode registers.
When the CPU is set to opreate in external extended or processor mode, P0-P4 and P225 all are
switched to the signal pins needed for external access. The CPU operation mode is determined by
setting the MOD0 and MOD1 pins. (See the table below.)
Table 8.2.1 CPU Operation Modes and P0-P4 and P225 Pin Functions
MOD0
MOD1
Operation Mode
P0-P4 Pin Function (except P46)
P46 and P225 Pin Function
VSS
(Note1)
VSS
Single-chip mode
Input/output port pin
Input/output port pin
VSS
VCC
External extended mode
External extended signal pin
External extended signal pin
or input/output port pin
(Note 2)
VCC
VSS
Processor mode
External extended signal pin
External extended signal pin
VCC
VCC
Reserved (use inhibited)
—
—
Note 1: VCC connects to +5 V, and VSS connects to GND.
Note 2: Only when the CPU is operating in external extended mode, P0-P4 (except P46) have their pin
functions switched by setting operation mode registers.
Only when the PCU is operating in external extended mode, P0-P4 (except P46) have their pin
functions switched between input/output port pins and internal peripheral I/O pins by setting up the
input/output port operation mode registers. Ports P6-P13, P15, P17, and P22 (except P6-P64, P97,
P221, P225) have their pin functions switched between input/output port and internal peripheral I/O
pins by setting up the input/output port operation mode registers. If any internal peripheral I/O has
multiple functions, select the desired pin function using the relevant internal peripheral I/O register.
Operation on FP and MOD1 pins during write to the internal flash memory does not affect
the pin functions.
INPUT/OUTPUT PORTS AND PIN FUNCTIONS
8.2 Selecting Pin Functions
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...