Port 4 - NEC V850ES/KE1+ User Manual

4.3.3 Port 4

Port 4 is a 3-bit I/O port for which I/O settings can be controlled in 1-bit units.
Port 4 includes the following alternate functions.
Pin No. Pin Name
19 P40
20 P41
21 P42
Note Software pull-up function
Caution P40 and P42 have hysteresis characteristics when the alternate function is input, but not in the
port mode.
(1) Port 4 register (P4)
After reset: 00H (output latch)
P4
(2) Port 4 mode register (PM4)
After reset: FFH
PM4
PM4n
CHAPTER 4 PORT FUNCTIONS
Table 4-6. Alternate-Function Pins of Port 4
Alternate Function
SI00 Input
SO00 Output
SCK00 I/O
R/W
0 0 0
P4n Control of output data (in output mode) (n = 0 to 2)
0 0 is output
1
1 is output
R/W Address: FFFFF428H
1 1 1
Control of I/O mode (n = 0 to 2)
0
Output mode
1 Input mode
User's Manual U16896EJ2V0UD
Note
I/O PULL
Yes
N-ch open-drain output can
be selected.
Address: FFFFF408H
0 0 P42
1 1 PM42
Remark Block Type
– D1-SUL
D0-UF
D2-SUFL
P41 P40
PM41 PM40
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