M16C26 Datasheet, PDF (176/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative
Programmable I/O Ports
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
Port control register
b7 b6 b5 b4 b3 b2 b1 b0
Symbpl
PCR
Address
03FF16
When reset
000000002
Bit symbol
Bit name
PCR0
Port P1 control register
Function
0 : When input port, read port
input level. When output port,
read the contents of port P1
register.
1 : Read the contents of port P1
register when input and output
port.
RW
Nothing is assigned.
In an attempt to write to these bits, write 0. The value, if read, turns
out to be 0.
Figure 1.17.8. Port control register
Table 1.17.1. Example connection of unused pins in single-chip mode
Pin name
Connection
Ports P15-P17, P6, P7, ^{After setting to input mode, connect every pin to Vss via a resistor (pull-down);}
P80-P83, P86-P87,
or after setting to output mode, leave these pins open.
P90-P3, P10
P85(NMI/SD)
XOUT (Note 1)
After setting to input mode, connect to Vcc via a resistor (pull-up).
Open
AVcc
Connect to Vcc
AVSS, VREF
Connect to Vss
VDC
Connect via a 0.1uF capacitor to Vss
Note 1: With external clock input to XIN pin.
Microcomputer
Port P15-P17, P6, P7, P80-P83,
P85-P87, P90-P93, P10
(Input mode)
(Output mode)
Open
NMI (Note)
XOUT
AVCC
AVSS
VREF
VDC
Open
VCC
VSS
Note: When P85 is to be used as NMI,
a pullup resistor should be connected.
Figure 1.17.9. Example connection of unused pins
170
Renesas Technology Corp.