Chapter 4 Jumpers and Switches
UG-910097-11
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© Fujitsu Semiconductor Europe GmbH
Switch
Setting
Description
SW1-1
ON
P127 pulled up to MCU’s VCC5
SW1-2
OFF
MCU’s MD0 (pin 86) disconnected from MCU’s VCC5
ON
MCU’s MD0 (pin 86) connected to MCU’s VCC5
Table 4. SW1 settings for Program and Run modes.
4.3 Reset Generation (SW3)
The onboard Supervisor IC (U2) for the voltage level monitoring generates a reset if the
voltage supply of 5V falls under 4.75V and 3.3V falls under 3.14V. Additionally, it is possible
to generate a reset via push button SW3.
SW3
By pushing this button a reset is generated.
-
Pushed momentarily
Soft Reset (Reset asserted for 100us only: Reset LED,
LD8, does NOT turn on.)
-
Pushed for longer than 2 seconds
Hard Reset (Reset asserted for 200ms:
Reset LED, LD8, turns on until button is released.)
Note:
-
During normal operation, Reset LED, LD8, should be off.
-
If the Reset LED is steadily on or blinks periodically, check the power supply
input voltage.
4.4 NTSC Decoder (JP1)
The Graphics Display Controller (GDC) of the device has a internal NTSC decoder. The
decoder has its own dedicated Analog-to-Digital converter whose low side reference voltage
can be set through JP1.
JP1
Pro
vides NTSC decoder’s A/D with AVSS3V3 as low voltage reference; external
reference voltage can be connected.
Jumper
Setting
Description
JP1
Closed
AVSS3V3 connected to AVR3 (pin 203)
Open
External voltage reference may be
provided.
Table 5
. NTSC Decoder’s A/D Low Reference Voltage.
4.5 Rotary Encoder RE1 (JP4, JP6)
The on-board Rotary Encoder (RE1) has the following jumpers:
JP4
Connect/Disconnect Channel B output of Rotary Encoder from MCU’s ICU0 (pin
110).
JP6
Connect/Disconnect
Channel A output of Rotary Encoder from MCU’s ICU5_2 (pin
109).
