Renesas SH7641 Technical Information Seite 211

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189
Notes: 1. Handling of the TCK, TMS, TDI, /TRST, /ASEBRKAK, and /ASEMD0 pins
depends on the use conditions of the H-UDI as follows:
(a) When the user system is used by connecting the emulator, the /ASEMD0 pin
must be grounded. The TCK, TMS, TDI, /TRST, and /ASEBRKAK pins must
be pulled up by a resistance of several kilo-ohms to protect the devices.
(b) When the emulator is used and the user system is independently used,
the /ASEMD0 pin should be switched on the board as the method of handling
this pin depends on whether the emulator is used or not. The TCK, TMS,
TDI, and /ASEBRKAK pins must be pulled up by a resistance of several kilo-
ohms to protect the devices. The /TRST pin must be pulled down by a
resistance of several kilo-ohms and controlled individually.
(c) When the user system is independently used without using the emulator and
H-UDI, the /ASEMD0 pin must be pulled up by a resistance of several
kilo-ohms. It is recommended to pull up the TCK, TMS, and TDI pins by a
resistance of several kilo-ohms.
For the /TRST pin, input the same signal as for the /RESETP pin or pull it
down by a resistance of several kilo-ohms.
2. The /RESET signal in the user side is input to the /RESETP pin of the SH7641.
Connect this pin to the H-UDI port connector as the output from the user system.
3. The /TRST pin must be low for a certain period when the emulator is turned on
whether the H-UDI is used or not. Input the same signal as for the /RESETP pin
to the /TRST pin, or pull it down by a resistance of several kilo-ohms.
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