Registers Controlling Port Function; Format Of Port Mode Register - NEC 78K0 User Manual

4.3

Registers Controlling Port Function

Port functions are controlled by the following three types of registers.
• Port mode registers (PM0, PM1, PM3 to PM7, PM12, PM14)
• Port registers (P0 to P7, P12 to P14)
• Pull-up resistor option registers (PU0, PU1, PU3 to PU7, PU12, PU14)
(1) Port mode registers (PM0, PM1, PM3 to PM7, PM12, and PM14)
These registers specify input or output mode for the port in 1-bit units.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets these registers to FFH.
When port pins are used as alternate-function pins, set the port mode register and output latch as shown in Table
4-5.
Symbol 7 6
PM0 1 PM06
7 6
PM1 PM17 PM16
7 6
PM3
1 1
7 6
PM4
PM47 PM46
7 6
PM5
PM57 PM56
7 6
PM6 PM67 PM66
7 6
PM7 PM77 PM76
7 6
PM12 1 1
7 6
PM14
1 1
PMmn
0 Output mode (output buffer on)
1 Input mode (output buffer off)
CHAPTER 4 PORT FUNCTIONS
Figure 4-26. Format of Port Mode Register
5 4 3
PM05 PM04 PM03
5 4 3
PM15 PM14 PM13
5 4 3
*
1 1 PM33
5 4 3
PM45 PM44 PM43
5 4 3
PM55 PM54 PM53
5 4 3
PM65 PM64 PM63
5 4 3
PM75 PM74 PM73
5 4 3
1 1 1
5 4 3
PM145 PM144 PM143
(m = 0, 1, 3 to 7, 12, 14; n = 0 to 7)
User's Manual U15947EJ2V0UD
2 1 0
PM02 PM01 PM00
2 1 0
PM12 PM11 PM10
2 1 0
PM32 PM31 PM30
2 1 0
PM42 PM41 PM40
2 1 0
PM52 PM51 PM50
2 1 0
PM62 PM61 PM60
2 1 0
PM72 PM71 PM70
2 1 0
1 1 PM120
2 1 0
PM142 PM141 PM140
Pmn pin I/O mode selection
Address After reset R/W
FF20H FFH R/W
FF21H FFH R/W
FF23H FFH R/W
FF24H FFH R/W
FF25H FFH R/W
FF26H FFH R/W
FF27H FFH R/W
FF2CH FFH R/W
FF2EH FFH R/W
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