UPD784044 Datasheet, PDF (16/90 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784044(A), 784046(A)
5.3 I/O Circuits of Pins and Processing of Unused Pins
Table 5-1 shows the I/O circuit type of each pin and recommended processing of the unused pins.
For the I/O circuit type, refer to Figure 5-1.
Table 5-1. I/O Circuit Type of Each Pin and Recommended Processing of Unused Pins
Pin Name
P00/RTP0-P03/RTP3
P10-P12
P11/TO21
P12/TO30
P13/TO31
P20/NMI
P21/INTP0/TO00
P22/INTP1/TO01
P23/INTP2/TO02
P24/INTP3/TO03
P25/INTP4
P26/INTP5/TI2
P27/INTP6/TI3
P30/TO10
P31/TO11
P32/RxD/SI1
P33/TxD/SO1
P34/ASCK/SCK1
P35/RxD2/SI2
P36/TxD2/SO2
P37/ASCK2/SCK2
P40/AD0-P47/AD7
P50/AD8-P57/AD15
P60/A16-P63/A19
P70/ANI0-P77/ANI7
P80/ANI8-P87/ANI15
P90/RD
P91/LWR
P92/HWR
P93/ASTB
P94/WAIT
MODE
RESET
CLKOUT
AVREF
AVSS
AVDD
I/O Circuit Type I/O
Recommended Connection of Unused Pins
5-A
I/O Input: Individually connect to VDD or VSS via resistor.
5
Output: Leave unconnected.
2
Input Connect to VSS.
8
I/O Input: Individually connect to VDD or VSS via resistor.
Output: Leave unconnected.
5
8
5
8
5-A
9
Input Connect to VSS.
5-A
I/O Input: Individually connect to VDD or VSS via resistor.
Output: Leave unconnected.
1
2
3
–
Input Directly connect to VSS.
–
Output Leave unconnected.
–
Connect to VSS.
Connect to VDD.
Remark The circuit type numbers are serial in the 78K series but are not always so with some models (because
some models are not provided with particular circuits).
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