Renesas SH7727 General Information Manual page 26

R0P7727TH003TRKE General Information Manual
(1) Power on Switch (SW1)
This switch turns on or off T-Engine. To turn on T-Engine, press and hold down this switch for 0.5
seconds or more. To turn it off, press and hold down this switch for 2 seconds or more when T-Engine
is being powered.
(2) Reset Switch (SW2)
This switch resets T-Engine. To reset devices other than the H8/3048-ONE, press this switch. To
reset and restart T-Engine, release this switch. In this case, the values of H8/3048-ONE internal
registers are not initialized. Among the control registers, the values of those that can be accessed by
SH7727 are initialized but the others are not (i.e., their values are retained). For more details, refer to
6.13 "Initial Values of the Power Supply Controller Register."
(3) NMI Switch (SW3)
This switch controls the SH7727 NMI pin. Press this switch and the SH7727 NMI pin will go "Low."
Release this switch, and the NMI pin will go "High."
(4) 8-bit DIP Switch (SW5)
Figure 3.2 shows the setting of an 8-bit DIP switch. This DIP switch is connected to the pins PTL2 to
PTL7, ASEMD, and MD5 of the SH7727. Be sure to turn off the power-on switch before setting the
DIP switch.
(a) Switches SW5-1 to SW5-6 are connected to pins PTL2 to PTL7 (input pins).
ON: The input pin goes "Low."
OFF: The input pin goes "High." (Factory setting)
(b) The SW5-7 switch is used to set the power-on condition of T-Engine.
ON: T-Engine is powered when power supply takes place through the AC adapter.
OFF: T-Engine is powered when the power-on switch is pressed. (Factory setting)
(c) The SW5-8 switch is connected to SH7727's pin MD5. The SW5-8 switch is used to set the type of
endian for SH7727 operation.
ON: The MD5 pin goes "Low" to set the big endian for SH7727 operation.
OFF: The MD5 pin goes "High" to set the little endian for SH7727 operation. (Factory setting)
ON
1
SW5-1
2 3 4 5 6 7
SW5-8
Figure 3.2 Setting the 8-bit DIP Switch
SW5-n
8
[OFF setting]
17
SW5-n
[ON setting]
Switches