8
8-29
Ver.0.10
INPUT/OUTPUT PORTS AND PIN FUNCTIONS
8.3 Input/Output Port Related Registers
■
Port Input Function Enable Register (PIEN)
<Address: H'0080 0745>
D8
9
10
11
12
13
14
D15
PIEN0
<When reset : H'00>
D
Bit Name
Function
R
W
8 - 14
No functions assigned
0
—
15
PIEN0
0 : Disables input (to prevent current from flowing in)
(Port input function enable bit)
1 : Enables input
This register is provided to prevent current from flowing into the port input pin. Because after reset
this register is set to disable input, it must be set to 1 before input can be processed.
During boot mode, all pins shared with serial I/O function are enabled for input, so that when
rewriting the flash memory via serial communication, you can set this register to 0 to prevent
current from flowing in from any pins other than serial I/O function.
The next page lists the pins that can be controlled by the Port Input Function Enable Register in
each mode.
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...