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Section 6 Power-Down Modes
Rev. 4.00 Sep. 14, 2005 Page 174 of 982
REJ09B0023-0400
6.3.3 Module
Standby
Function
1. Transition to Module Standby Function
Setting the standby control register MSTP bits to 1 halts the supply of clocks to the
corresponding on-chip peripheral modules (however, the initial state of the USB stops). This
function can be used to reduce the power consumption in normal mode and sleep mode.
Disable a module before placing it in the module standby mode. In addition, do not access the
module's registers while it is in the module-standby state.
In module standby state, the functions of the external pins of the on-chip peripheral modules
change depending on the on-chip peripheral module. For details on this, see Appendix A, Pin
States. The states of the registers are the same as in the standby mode. See table 6.3.
2. Canceling Module Standby Function
The module standby function except USB can be canceled by clearing the MSTP bits to 0, or
by a power-on reset. In the case of the USB module, setting the corresponding MSTP bit to 1
cancels the module standby state. When taking a module out of the module standby state by
clearing the corresponding bit to 0 (or setting it to 1 in the case of the USB module), read the
bit to confirm that it has been cleared to 0 (or set to 1 in the USB case).
6.3.4
STATUS Pin Change Timings
To use these pins as the STATUS1 and STATUS0 pins, the corresponding setting must be made in
the PFC. For details on setting of the PFC, see section 22, Pin Function Controller (PFC). A
power-on reset initializes the PFC setting; the default value selects operation as PTC15 and
PTC14 port-input pins. Accordingly, when you wish to use these pins for the STATUS function
immediately after a power-on reset, take the following steps. This also applies to power-on resets
from the WDT and resets from the H-UDI.
1. Pull up the STATUS1 and STATUS0 pins.
2. Change the PFC setting made by power-on reset processing so that the STATUS function is
selected for these pins.
Both STATUS1 and STATUS0 become high during a power-on reset and are low on completion
of power-on reset processing. The state of the LSI is thus indicated. The timing of the level
changes of the STATUS1 and STATUS0 pins is shown below.
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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