deveopmen
Usage precaution
Preliminary Specifications REV.D
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C/80 (100-pin version) group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
207
Reducing power consumption
(1) When A-D conversion is not performed, select the Vref not connected with the Vref connect bit of A-D
control register 1. When A-D conversion is performed, start the A-D conversion at least 1
μ
s or longer
after connecting Vref.
(2) When using AN4 (P10
4
) to AN7 (P10
7
), select the input disable of the key input interrupt signal with
the key input interrupt disable bit of the function select register C .
When selecting the input disable of the key input interrupt signal, the key input interrupt cannot be
used. Also, the port cannot be input even if the direction register of P10
4
to P10
7
is set to input (the
input result becomes undefined). When the input disable of the key input interrupt signal is selected,
use all AN4 to AN7 as A-D inputs.
(3) When ANEX0 and ANEX1 are used, select the input peripheral function disable with port P9
5
and P9
6
input peripheral function select bit of the function select register B3.
When the input peripheral function disable is selected, the port cannot be input even if the port direc-
tion register is set to input (the input result becomes undefined).
Also, it is not possible to input a peripheral function except ANEX0 and ANEX1.
(4) When D-A converter is not used, set output disabled with the D-A output enable bit of D-A control
register and set the D-A register to "00
16
".
(5) When D-A conversion is used, select the input peripheral function disabled with port P9
3
and P9
4
input
peripheral function select bit of the function select register B3.
When the input peripheral function disabled is selected, the port cannot be input even if the port
direction register is set to input (the input result becomes undefined).
Also, it is not possible to input a peripheral function.
Precautions for using CLK
OUT
pin
When using the Clock Output function of P5
3
/CLK
OUT
pin (f
8
, f
32
or fc output) in single chip mode, use
port P5
7
as an input only port (port P5
7
direction register is "0").
Although port P5
7
may be set as an output port, it will become high impedance and will not output "H" or
"L" levels.