M16C6K9 Datasheet, PDF (17/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Reset
Reset
There are two kinds of resets; hardware and software. In both cases, operation is the same after the reset.
(See “Software Reset” for details of software resets.) This section explains the hardware reset.
When the supply voltage is in the range where operation is guaranteed, a reset is effected by holding the
reset pin level “L” (0.2VCC max.) for at least 20 cycles. When the reset pin level is then returned to the “H”
level while main clock is stable, the reset status is cancelled and program execution resumes from the
address in the reset vector table.
Fig.VB-1 shows the example reset circuit. Fig.VB-2 shows the reset sequence.
RESET
VCC
3.3V
VCC
0V
3.3V
RESET
0V
3.0V
0.6V
Example when VCC = 3.3V
Fig.VB-1 Example reset circuit
XIN
More than 20 cycles are needed
RESET
Internal
clock Φ
Single chip
mode
Address
BCLK 24cycles
FFFFC16
Content of reset vector
FFFFE16
Fig.VB-2 Reset sequence
Rev.1.00 Jun 06, 2003 page 17 of 290