參數(shù)資料
型號： MC68HC58DW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 29/102頁
文件大?。?/td> 700K
代理商： MC68HC58DW
MOTOROLA
SIGNAL AND PIN DESCRIPTIONS
MC68HC58
2-16
TECHNICAL DATA
2.5.3 Method 3 — Switching V
DD and VCC Simultaneously
When V
BATT alone is applied, the PSEN pin stays in a high-impedance state until VDD
and VCC are applied. Applying VDD and VCC simultaneously (using a common 5 Vdc
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.
Figure 2-6 Method 3 — Switching V
DD and VCC in Standby Mode
12V
0V
5V
0V
5V
0V
12V
0V
POWER OFF
NORMAL
POWER OFF
VBATT
VCC/VDD
RST
INT
PSEN
DLC MODE
DLC PMC3
RESET
HIGH IMPEDANCE
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