4524_M Datasheet, PDF (294/310 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 720 FAMILY / 4500 SERIES

4524 Group
APPENDIX
3.3 List of precautions
Table 3.3.1 Connections of unused pins
Pin
XIN
XOUT
XCIN
XCOUT
D0–D3
D4/SIN
D5/SOUT
D6/SCK
D7/CNTR0
D8/INT0
D9/INT1
C/CNTR1
P00–P03
P10–P13
P20/AIN0–
P23/AIN3
P30/AIN4–
P33/AIN7
P40–P43
COM0–COM3
VLC3/SEG0
VLC2/SEG1
VLC1/SEG2
SEG3–SEG19
Connection
Usage condition
Connect to VSS. Internal oscillator is selected (CMCK and CRCK instructions are not executed.) (Note 1)
Sub-clock input is selected for system clock (MR0=1).
(Note 2)
Open.
Internal oscillator is selected (CMCK and CRCK instructions are not executed.) (Note 1)
RC oscillator is selected (CRCK instruction is executed)
External clock input is selected for main clock (CMCK instruction is executed). (Note 3)
Sub-clock input is selected for system clock (MR0=1).
(Note 2)
Connect to VSS. Sub-clock is not used.
Open.
Sub-clock is not used.
Open.
Connect to VSS. N-channel open-drain is selected for the output structure.
(Note 4)
Open.
SIN pin is not selected.
Connect to VSS. N-channel open-drain is selected for the output structure.
Open.
Connect to VSS. N-channel open-drain is selected for the output structure.
Open.
SCK pin is not selected.
Connect to VSS. N-channel open-drain is selected for the output structure.
Open.
CNTR0 input is not selected for timer 1 count source.
Connect to VSS. N-channel open-drain is selected for the output structure.
Open.
“0” is set to output latch.
Connect to VSS.
Open.
“0” is set to output latch.
Connect to VSS.
Open.
CNTR1 input is not selected for timer 3 count source.
Open.
The key-on wakeup function is not selected.
(Note 4)
Connect to Vss. N-channel open-drain is selected for the output structure.
(Note 5)
The pull-up function is not selected.
(Note 4)
The key-on wakeup function is not selected.
(Note 4)
Open.
The key-on wakeup function is not selected.
(Note 4)
Connect to Vss. N-channel open-drain is selected for the output structure.
(Note 5)
The pull-up function is not selected.
(Note 4)
The key-on wakeup function is not selected.
(Note 4)
Open.
Connect to Vss.
Open.
Connect to Vss.
Open.
Connect to Vss. N-channel open-drain is selected for the output structure.
(Note 4)
Open.
Open.
SEG0 pin is selected.
Open.
SEG1 pin is selected.
Open.
SEG2 pin is selected.
Open.
Notes 1: When the CMCK and CRCK instructions are not executed, the internal oscillation (on-chip oscillator)
is selected for main clock.
2: When sub-clock (XCIN) input is selected (MR0 = 1) for the system clock by setting “1” to bit 1 (MR1)
of clock control register MR, main clock is stopped.
3: Select the ceramic resonance by executing the CMCK instruction to use the external clock input
for the main clock.
4: Be sure to select the output structure of ports D0–D3 and P40–P43 and the pull-up function and key-
on wakeup function of P00–P03 and P10–P13 with every one port. Set the corresponding bits of
registers for each port.
5: Be sure to select the output structure of ports P00–P03 and P10–P13 with every two ports. If only
one of the two pins is used, leave another one open.
(Note when connecting unused pins to VSS or VDD)
q Connect the unused pins to VSS or VDD using the thickest wire at the shortest distance against noise.
Rev.2.00 Aug, 06 2004
REJ09B0107-0200Z
3-40