Port Configuration - NEC 78K0 User Manual

Pin Name I/O
P60 to P63 I/O
P64
P65
P66
P67
P70 to P77 I/O
P120 I/O
P130 Output
P140 I/O
P141
P142
P143
P144
P145
4.2

Port Configuration

Ports consist of the following hardware.
Item
Control registers
Port
Pull-up resistor
98
CHAPTER 4 PORT FUNCTIONS
Table 4-2. Port Functions (2/2)
Function
Port 6.
8-bit I/O port.
Input/output can be specified
in 1-bit units.
Port 7.
8-bit I/O port.
Input/output can be specified in 1-bit units.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Port 12.
1-bit I/O port.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Port 13.
1-bit output-only port.
Port 14.
6-bit I/O port.
Input/output can be specified in 1-bit units.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Table 4-3. Port Configuration
Port mode register (PM0, PM1, PM3 to PM7, PM12, PM14)
Port register (P0 to P7, P12 to P14)
Pull-up resistor option register (PU0, PU1, PU3 to PU7, PU12, PU14)
Total: 67 (CMOS I/O: 54, CMOS input: 8, CMOS output: 1, N-ch open drain I/O: 4)
• Mask ROM version
Total: 58 (software control: 54, mask option specification: 4)
• Flash memory version: Total: 54
User's Manual U15947EJ2V0UD
N-ch open-drain I/O port.
Use of an on-chip pull-up
resistor can be specified by a
mask option only for mask
ROM versions.
Use of an on-chip pull-up
resistor can be specified by a
software setting.
*
Configuration
After Reset Alternate Function
−
Input
RD
WR
WAIT
ASTB
Input KR0 to KR7
Input INTP0
−
Output
Input PCL/INTP6
BUZ/BUSY0/
INTP7
SCKA0
SIA0
SOA0
STB0