M16C62_M Datasheet, PDF (605/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Appendix 4
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Appendix 4 A practical example of connecting to the reset IC
M62015 and M62016 are reset ICs compatible with the M16C's backup mode. Here follow these ICs'
overview and characteristics together with an example of connecting to the M16C when Vcc = 3 V.
• Overview of the reset ICs
Either M62015 or M62016 detects the rising edge of the power, the falling edge, and abnormal voltage of
the power of the 3-V family of microcomputer systems. It is an optimal semiconductor integrated circuit to
reset or release the microcomputer system.
Either M62015 or M61016 carries out 2-step power voltage detection, and is provided with two output
terminals (the forced reset signal output RESET and the interrupt handling signal output INT). Either
M62015 or M62016 embeds the BiCMOS process and the low power consumption circuit, and outputs
optimal signals from respective output terminals with low power consumption especially in dealing with a
system that requires its RAM backup.
• Characteristics of the reset ICs
* BiCMOS process low-consumption circuit configuration
Circuit current
Icc = 3 µA (standard value normal mode Vcc = 3.0 V)
Icc = 3 µA (standard value backup mode Vcc = 2.5 V)
* Two-step power voltage detection
Normal power detection
Vs = 2.7 V (standard value)
Power detection for backup
VBATT = 2.0 V (standard value)
* Two outputs
Forced reset signal output
Interrupt handling signal output
____________
RESET
______
INT
* Output form
CMOS output
: M62015
Open drain output
: M62016
• A practical example of connection
Power supply
VCC(+3V)
Power for backup
Smoothing ⁺
capacity
100µF
VCC
Power
VCC
Note
terminal
VBATT(+3V)
+
-
INT
INT
Interrupt
handling
signal
INT
Interrupt input
Delay
capacity
0.33µF
+
-
RESET
Cd
Reset IC
M62015 / M62016
RESET
Forced reset
signal
Note: Pull-up resistors are necessary only for open drain output form.
RESET
Reset input
Clock signal
input/output
M16C/62A group
2-288