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Section 22 Pin Function Controller (PFC)
Rev. 4.00 Sep. 14, 2005 Page 841 of 982
REJ09B0023-0400
22.2
I/O Buffer Internal Block Diagram
22.2.1
I/O Buffer with Weak Keeper
All the I/O buffers except PTG10, PTG9, and PTG 7 to PTG 0 (IIC2 and analog pins) listed in
table 22.1 have weak keepers that consist of two inverters to keep the status of the pin. Figure 22.1
shows the internal block diagram of the I/O buffer.
Output enalbe
Output data
Input data
Weak keeper
I/O buffer
Figure 22.1 Internal Block Diagram of I/O Buffer with Weak Keeper
22.2.2
I/O Buffer with Open Drain Output
PTG10 and PTG9 are multiplexed with the IIC2 (SDA, SCL) pins and consist of the normal I/O
buffer and the I/O buffer with an open drain output. Setting the port G control register (PGCR) to
port input or port output enables the normal I/O buffer. Setting the PGCR to other function (IIC2)
enables the I/O buffer with an open drain output.
Figure 22.2 shows the internal block diagram of the I/O buffer with an open drain output.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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