NEC 78K0S/KB1+ User Manual page 66

(3) Port mode control register 2 (PMC2)
This register specifies the port mode or A/D converter mode.
Each bit of the PMC2 register corresponds to each pin of port 2 and can be specified in 1-bit units.
PMC2 is set by using a 1-bit or 8-bit memory manipulation instruction.
Generation of reset signal sets PMC2 to 00H.
Address: FF84H After reset: 00H R/W
Symbol 7
PMC2 0
PMC2n
0
1
<R>
Caution When PMC20 to PMC23 are set to 1, the P20/ANI0 to P23/ANI3 pins cannot be used as port
pins. Moreover, be sure to set the pull-up resistor option registers (PU20 to PU23) to 0 for
the pins set to A/D converter mode.
Table 4-3. Setting of Port Mode Register, Port Register (Output Latch), and Port Mode Control Register
Port Name
P20 to P23 ANI0 to ANI3
P30 TI000
INTP0
P31 TO00
TI010
INTP2
P41 INTP3
P42 TOH1
P43 TxD6
INTP1
P44 RxD6
Remark ×:
PM××:
PMC2×: Port mode control register
66
CHAPTER 4 PORT FUNCTIONS
Figure 4-17. Format of Port Mode Control Register 2
6 5
0 0
Specification of operation mode (n = 0 to 3)
Port mode
A/D converter mode
When Alternate Function Is Used
Alternate-Function Pin
Name
don't care
Port mode register, P××: Port register (output latch of port)
User's Manual U17446EJ3V1UD
4 3
0 PMC23 PMC22
PM××
I/O
Input 1
Input 1
Input 1
Output 0
Input 1
Input 1
Input 1
Output 0
Output 0
Input 1
Input 1
2 1 0
PMC21 PMC20
P×× PMC2n
(n = 0 to 3)
×
×
×
0
×
×
×
0
1
×
×
1
−
−
−
−
−
−
−
−
−
−