Renesas M16C FAMILY series Hardware Manual page 315

M 1 6 C 2 / 8 G o r u p ( M 1 6 C
Table 17.1 Unassigned Pin Handling in Single-Chip Mode
P n i N a m e
P r o s t P 0 o t P , 3 P 6 o t
X
O U T
X
N I
A V
C C
A V , V
S S R E F
NOTES:
1. If the port enters output mode and is left open, it is in input mode before output mode is entered by program
after reset. While the port is in input mode, voltage level on the pins is indeterminate and power consumption
may increase. Direction register setting may be changed by noise or failure caused by noise. Configure
direction register settings regulary to increase the reliability of the program.
2. Use the shortest possible wiring to connect the MCU pins to unassigned pins (within 2 cm).
3. When the external clock or V
4. In the 64-pin package, set bits PACR2, PACR1, and PACR0 in the PACR register to 010
85-pin packages, set bits PACR2, PACR1, and PACR0 to 011
5. When the main clock oscillation is not used, set the CM05 bit in the CM0 register to 1 (main clock stops) to
reduce power consumption.
NOTE:
Figure 17.13 Unassigned Pins Handling
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
P 1 0 E t n r e n i p t u
r o e t n r e o u p t
L e a v e p n i o
C o n n e t c p n i
C o n n e t c p n i
C o n n e t c p n i
is applied to the XIN pin, set the pin as written above.
CC
Microcomputer
Port P0 to P3, P6 to P10
(1)
(Input mode)
·
·
·
(Input mode)
(Output mode)
X
IN
X
OUT
AV
CC
AV
SS
V
ref
In single-chip mode
1. When using the 64-pin package, set the PACR2, PACR1 and PACR0 bits to "010
When using the 80-/85-pin package, set the PACR2, PACR1 and PACR0 bits to "011
page 295
f o 3 8 5
S
m o d e a n d c o n n e t c e a c h
t u m o d e a n d e l a v e h t e
p e n ( ) 3
o t V v a i a e r s t s i r o p (
C C
o t V
C C
o t V
S S
.
2
·
·
·
Open
Open
V
CC
V
SS
17. Programmable I/O Ports
e t t n i g
p n i o t V v a i a e r s t s i r o
S S
p n i s o p e n ( , 1 , 2 ) 4
l l u u - ) p ( ) 5
. In the 80-pin and
2
p ( l l u d - o w n ; )
"
2
"
2