MC68HC05E0 Datasheet, PDF (37/96 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

4
RESETS, INTERRUPTS
4
AND LOW POWER MODES
4.1
Resets
The MCU can be reset by the initial power-on reset function or by an active low level applied to the
RESET pin (see Figure 4-1).
t_VDDR
V_DD
V_DD threshold (1-2V typical)
t_OXOV
OSC1
t_PORL
t_CYC
Internal
processor clock
RESET
Internal
address bus
Internal
data bus
(Internal power-on reset)
t_RL(or t_DOGL) _{(External hardware reset)}
New
7FFE 7FFE 7FFE 7FFE 7FFF _PC
Reset sequence
New New Op
PCH PCL code
Program
execution
begins
7FFE 7FFE 7FFE 7FFE
7FFF
New
PC
Reset sequence
New New Op
PCH PCL code
Program
execution
begins
Figure 4-1 Power-on Reset and RESET
MC68HC05E0
RESETS, INTERRUPTS AND LOW POWER MODES
MOTOROLA
4-1