CHAPTER 2 PIN FUNCTIONS
User’s Manual U17260EJ6V0UD
44
Table 2-2. Pin I/O Circuit Types (2/2)
Pin Name
I/O Circuit Type
I/O
Recommended Connection of Unused Pins
P60/SCL0
P61/SDA0
P62/EXSCL0
13-AD
P63
13-P
Input:
Connect to EVSS.
Output: Leave this pin open at low-level output after clearing
the output latch of the port to 0.
P70/KR0 to P77/KR7
P120/INTP0/EXLVI
5-AH
Input:
Independently connect to EVDD or EVSS via a resistor.
Output: Leave open.
P121/X1/OCD0A
Notes 1, 2, 5
P122/X2/EXCLK
OCD0B
Notes 1, 5
P123/XT1
Note 1
P124/XT2/EXCLKS
Note 1
37
I/O
Input:
Independently connect to VDD or VSS via a resistor.
Output: Leave open.
P130
3-C
Output
Leave open.
P140/PCL/INTP6
P141/BUZ/INTP7
5-AH
I/O
Input:
Independently connect to EVDD or EVSS via a resistor.
Output: Leave open.
AVREF
Connect directly to EVDD or VDD
Note 3.
AVSS
Connect directly to EVSS or VSS.
FLMD0
38
Input
Connect to EVSS or VSS
Note 4.
RESET
2
Input
Connect directly to VDD or via a resistor.
Notes 1. Use recommended connection above in I/O port mode (see Figure 6-2 Format of Clock Operation
Mode Select Register (OSCCTL)) when these pins are not used.
2. For products without an on-chip debug function and with the flash memory of 48 KB or more
(
PD78F0534, 78F0535, 78F0536, and 78F0537) and having a product rank of “I”, “K”, or “E”, and for
the product with an on-chip debug function (
PD78F0537D), connect P121/X1/OCD0ANote 5 as follows
when writing the flash memory with a flash memory programmer.
P121/X1/OCD0ANote 5: When using this pin as a port, connect it to VSS via a resistor (10 k:
recommended) (in the input mode) or leave it open (in the output mode).
The above connection is not necessary when writing the flash memory by means of self programming.
3. Make the same potential as the VDD pin when port 2 is used as a digital port.
4. FLMD0 is a pin that is used to write data to the flash memory. To rewrite the data of the flash memory
on-board, connect this pin to EVSS or VSS via a resistor (10 k
: recommended). The same applies
when executing on-chip debugging with a product with an on-chip debug function (
PD78F0537D).
5. OCD0A and OCD0B are provided to the
PD78F0537D only.
Remark
For the product ranks, consult an NEC Electronics sales representative.