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Section 23 I/O Ports
Rev. 4.00 Sep. 14, 2005 Page 846 of 982
REJ09B0023-0400
23.2.2
Port B Data Register (PBDR)
PBDR is a 9-bit readable/writable register with seven reserved bits that stores data for pins PTB8
to PTB0. PBDR is initialized to H
'
0000 by a power-on reset, but it retains its previous value by a
manual reset, in standby mode, or in sleep mode.
Bit Bit
Name
Initial
Value R/W
Description
15 to 9
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
7 PB7DT
0 R/W
6 PB6DT
0 R/W
5 PB5DT
0 R/W
4 PB4DT
0 R/W
3 PB3DT
0 R/W
2 PB2DT
0 R/W
1 PB1DT
0 R/W
0 PB0DT
0 R/W
Bits PB8DT to PB0DT correspond to pins PTB8 to
PTB0. When the pin function is general output port, the
value of the corresponding bit in PBDR is returned
directly by reading the port. When the function is
general input port, the corresponding pin level is read
by reading the port. Table 23.2 shows the function of
PBDR.
Table 23.2 Port B Data Register (PBDR) Read/Write Operations
PBnMD2 PBnMD1 Pin
State
Read
Write
0
0
Input
Pin state
Data is written to PBDR, but does not affect
pin state.
1
Output
PBDR value
Data is written to PBDR and the value is
output from the pin.
1 0 Reserved
1
Other functions Pin state
Data is written to PBDR, but does not affect
pin state.
(n = 0 to 8)
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
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