Cypress MB95710M Series - Block Diagram (MB95710 M Series)

MB95710M Series
MB95770M Series
Document Number: 002-09307 Rev. *D Page 32 of 172
•DBG pin
Connect the DBG pin to an external pull-up resistor of 2 kΩ or above.
After power-on, ensure that the DBG pin does not stay at “L” level until the reset output is released.
The DBG pin becomes a communication pin in debug mode. Since the actual pull-up resistance depends on the tool
used and the interconnection length, refer to the tool document when selecting a pull-up resistor.
•RST
pin
Connect the RST
pin to an external pull-up resistor of 2 kΩ or above.
To prevent the device from unintentionally entering the reset mode due to noise, minimize the interconnection length
between a pull-up resistor and the RST
pin and that between a pull-up resistor and the VCC pin when designing the
layout of the printed circuit board.
The PF2/RST
pin functions as the reset input/output pin after power-on. In addition, the reset output of the PF2/RST
pin can be enabled by the RSTOE bit in the SYSC register, and the reset input function and the general-purpose I/O
function can be selected by the RSTEN bit in the SYSC register.
• Analog power supply
Always set the same potential to the AV
CC pin and the VCC pin. When VCC is larger than AVCC, the current may flow
through the AN00 to AN07 pins.
• Treatment of power supply pins on the 8/12-bit A/D converter
Ensure that AV
CC is equal to VCC and AVSS equal to VSS even when the 8/12-bit A/D converter is not in use.
Noise riding on the AV
CC pin may cause accuracy degradation. Therefore, connect a ceramic capacitor of 0.1 µF (ap-
prox.) as a bypass capacitor between the AV
CC pin and the AVSS pin in the vicinity of this device.
•C pin
Use a ceramic capacitor or a capacitor with equivalent frequency characteristics. The decoupling capacitor for the
V
CC pin must have a capacitance equal to or larger than the capacitance of CS. For the connection to a decoupling
capacitor C
S, see the diagram below. To prevent the device from unintentionally entering a mode to which the device
is not set to transit due to noise, minimize the distance between the C pin and C
S and the distance between CS and
the V
SS pin when designing the layout of a printed circuit board.
• Note on serial communication
In serial communication, reception of wrong data may occur due to noise or other causes. Therefore, design a printed
circuit board to prevent noise from occurring. Taking account of the reception of wrong data, take measures such as
adding a checksum to the end of data in order to detect errors. If an error is detected, retransmit the data.
C
Cs
DBG
RST
• DBG/RST/C pins connection diagram