Renesas SH7641 Informações Técnicas descarregar pdf (Página 211)

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.

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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