CHAPTER 4 PORT FUNCTIONS
(d) Port 3 function register H (PF3H)
This is an 8-bit register that specifies N-ch open-drain output.
This register can be read/written in 8-bit or 1-bit units.
After Reset: 00H
R/W
0
Address: FFFFFC67H
PF3H
0
0
0
0
0
PF39
PF38
PF3n
Control of N-ch open-drain output (n = 8, 9)
0
1
N-ch open-drain output (when used as normal port)
N-ch open-drain output (when used as alternate-function)
Caution When using P38 and P39 as N-ch open-drain-output alternate-function pins, set
in the following sequence.
Be sure to set the port latch to 1 before setting the pin to N-ch open-drain output.
P3n bit = 1 → PF3n bit = 1 → PMC3n bit = 1
(e) Port 3 function control register (PFC3)
This is an 8-bit register that specifies control mode 1/control mode 2.
This register can be read/written in 8-bit or 1-bit units.
(i) V850ES/KF1, V850ES/KG1, V850ES/KJ1
After Reset: 00H
R/W
Address: FFFFF466H
PFC3
0
0
PFC35
0
PFC33
0
0
0
PFC35
Specification of P35 pin operation mode in control mode
0
1
TI010 input
TO01 output
PFC33
Specification of P33 pin operation mode in control mode
0
1
TI000 input
TO00 output
Caution Always set PFC3 register bits 0 to 2, 4, 6, and 7 to 0.
User’s Manual U15862EJ3V0UD
158
NEC [ NEC ]
