UPD78F1502AGK-GAK-AX Datasheet, PDF (74/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 2 PIN FUNCTIONS
<R> _{2.2.20 VREFOUT/AVREFP (μ PD78F150xA only)}
VREFOUT is an analog reference voltage output pin for voltage reference.
AVREFP is the pin that inputs the positive reference voltage of the A/D converter and D/A converter.
<R> _{2.2.21 AVREF (μ PD78F151xA only)}
AVREF is the pin that inputs the positive reference voltage of the A/D converter.
2.2.22 RESET
This is the active-low system reset input pin.
When the external reset pin is not used, connect this pin directly to EVDD or via a resistor.
When the external reset pin is used, design the circuit based on VDD.
2.2.23 REGC
This is the pin for connecting regulator output (2.4 V) stabilization capacitance for internal operation. Connect this pin
to VSS via a capacitor (0.47 to 1 μF).
Also, use a capacitor with good characteristics, since it is used to stabilize internal voltage.
REGC
VSS
Caution Keep the wiring length as short as possible for the broken-line part in the above figure.
2.2.24 FLMD0
This is a pin for setting flash memory programming mode.
Perform either of the following processing.
(a) In normal operation mode
It is recommended to leave this pin open during normal operation.
The FLMD0 pin must always be kept at the VSS level before reset release but does not have to be pulled down
externally because it is internally pulled down by reset. However, pulling it down must be kept selected (i.e.,
FLMDPUP = “0”, default value) by using bit 7 (FLMDPUP) of the background event control register (BECTL) (see
27.5 (1) Back ground event control register). To pull it down externally, use a resistor of 200 kΩ or smaller.
Self programming and the rewriting of flash memory with the programmer can be prohibited using hardware, by
directly connecting this pin to the VSS pin.
(b) In self programming mode
It is recommended to leave this pin open when using the self programming function. To pull it down externally,
use a resistor of 100 kΩ to 200 kΩ.
In the self programming mode, the setting is switched to pull up in the self programming library.
(c) In flash memory programming mode
Directly connect this pin to a flash memory programmer when data is written by the flash memory programmer.
This supplies a writing voltage of the VDD level to the FLMD0 pin.
The FLMD0 pin does not have to be pulled down externally because it is internally pulled down by reset. To pull
it down externally, use a resistor of 1 kΩ to 200 kΩ.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011