UPD784938 Datasheet, PDF (62/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
2.3 Input/Output Circuits and Connection of Unused Pins
Table 2-5 shows the input/output circuit types of the pins that have functions, and the connection method when that function
is not used.
Each input/output circuit type is shown in Figure 2-1.
Table 2-5. Pin Input/Output Circuit Types and Recommended Connection of Unused Pins (1/2)
Pin Name
P00 to P07
P10, P11
P12/ASCK2/SCK2
P13/RxD2/SI2
P14/TxD2/SO2
P15 to P17
P20/NMI
P21/INTP0
P22/INTP1
P23/INTP2/CI
P24/INTP3
P25/INTP4/ASCK/SCK1
P26/INTP5
P27/SI0
P30/RxD/SI1
P31/TxD/SO1
P32/SCK0
P33/SO0
P34/TO0 to P37/TO3
P40/AD0 to P47/AD7
P50/A8 to P57/A15
P60/A16 to P63/A19
P64/RD
P65/WR
P66/WAIT/HLDRQ
P67/REFRQ/HLDAK
Input/Output
Circuit Type
5-A
8-A
5-A
Input/Output
Input/output
Recommended Connection
of Unused Pins
Input: Connect to VDD
Output: Leave open
2
Input
Connect to VDD or VSS
2-A
Connect to VDD
8-A
2-A
5-A
10-A
5-A
Input/output
Input
Input/output
Input: Connect to VDD
Output: Leave open
Connect to VDD
Input: Connect to VDD
Output: Leave open
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Preliminary User’s Manual U13987EJ1V0UM00