MC68HC58 Motorola, MC68HC58 Datasheet - Page 32

• Manufacturer Part Number: MC68HC58
• Description: Data Link Controller
• Manufacturer: Motorola

2.5.3 Method 3 — Switching V
2-16
MOTOROLA
When V
and V
supply) activates the DLC and causes the PSEN pin to source 12 Vdc. If this method
is chosen, the DLC is not affected by bus activity. Figure 2-6 shows BUS, INT, RST,
and PSEN timing relationships. Refer to APPENDIX A ELECTRICAL CHARACTER-
ISTICS for more information on parameter specifications.
CC
Figure 2-6 Method 3 — Switching V
BATT
are applied. Applying V
DLC MODE
V
CC
alone is applied, the PSEN pin stays in a high-impedance state until V
V
PSEN
/V
BATT
RST
INT
DD
12V
12V
0V
0V
0V
5V
0V
5V
5V
0V
POWER OFF
HIGH IMPEDANCE
SIGNAL AND PIN DESCRIPTIONS
DD
and V
DD
RESET
and V
CC
Simultaneously
CC
DD
simultaneously (using a common 5 Vdc
and V
NORMAL
CC
RESET
in Standby Mode
HIGH IMPEDANCE
POWER OFF
TECHNICAL DATA
DLC PMC3
MC68HC58
DD