S6E2C2 Datasheet, PDF (76/207 Pages) Cypress Semiconductor – 32-bit ARM® Cortex®-M4F FM4 Microcontroller

S6E2C2 Series
Using an External Clock
When using an external clock as an input of the main clock, set X0/X1 to the external clock input, and input the clock to X0. X1(PE3)
can be used as a general-purpose I/O port. Similarly, when using an external clock as an input of the sub clock, set X0A/X1A to the
external clock input and input the clock to X0A. X1A (P47) can be used as a general-purpose I/O port.
 Example of Using an External Clock
Device
Can be used as
general-purpose
I/O ports.
X0(X0A)
X1(PE3), X1A (P47)
Set as external clock
input
Handling When Using Multi-Function Serial Pin as I²C Pin
If the application uses the multi-function serial pin as an I²C pin, the P-channel transistor of the digital output must be disabled. I²C
pins need to conform to electrical limitations like other pins, however, and avoid connecting to live external systems with the MCU
power off.
C Pin
Devices in this series contain a regulator. Be sure to connect a smoothing capacitor (CS) for the regulator between the C pin and the
GND pin. Please use a ceramic capacitor or a capacitor of equivalent frequency characteristics as a smoothing capacitor. Some
laminated ceramic capacitors have a large capacitance variation due to thermal fluctuation. Please select a capacitor that meets the
specifications in the operating conditions to use by evaluating the temperature characteristics of the device. A smoothing capacitor
of about 4.7 μF would be recommended for this series.
Device
C
CS
VSS
GND
Mode Pins (MD0)
Connect the MD pin (MD0) directly to VCC or VSS pins. Design the printed circuit board such that the pull-up/down resistance stays
low, the distance between the mode pins and VCC pins or VSS pins is as short as possible, and the connection impedance is low
when the pins are pulled up/down such as for switching the pin level and rewriting the flash memory data. This is important to
prevent the device from erroneously switching to test mode as a result of noise.
Document Number: 002-05030 Rev.*A
Page 76 of 207