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參數(shù)資料
| 型號： | MC68HC05V7 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 295K |
| 代理商： | MC68HC05V7 |
MOTOROLA
12
AN1257/D
Figure 6. Voltage Regulator Initialization Flowchart
POWER APPLIED
TO V
BATT
PIN OF MCU
IS
V
ABOVE
MINIMUM V-REG
SPEC
MCU IN UNKNOWN
OPERATING STATE
NO
YES
IS
V
DD
> MINIMUM
FOR MCU
OPERATION
NO
YES
A
A
IS
V
DD
> V
LVRR
LVR CIRCUIT HOLDS RESET
ASSERTED INTERNALLY
NO
YES
%0X000001 WRITTEN TO
MISC REGISTER BY MCU
INITIALIZATION ROUTINE
REMAINDER OF MCU
INITIALIZATION ROUTINE
COMPLETED
IS POR
CIRCUIT OUTPUT
> VIH
MIN
OF RST
PIN
NO
YES
POR CIRCUIT RELEASES
RST PIN EXTERNALLY
APPLICATION SOFTWARE
ROUTINE BEGINS
Area within dotted line delineates user
software required for proper operation
once primary regulator is enabled.
AAAAAAA
AA
AAAAAAA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
CPU FETCHES PROGRAM
STARTING ADDRESS FROM
RESET VECTOR; USER
PROGRAM SEQUENCE
BEGINS . . .
FOLLOWING 4064 CPU CLOCK
CYCLES, LVR CIRCUIT
RELEASES MCU RESET
INTERNALLY
POR CIRCUIT ON RST PIN
KEEPS RESET ASSERTED
EXTERNALLY AND INTERNALLY
SECONDARY
REGULATOR ENABLED;
PRIMARY REGULATOR IN
STANDBY MODE; V
DD
/V
SSD
CLAMP ENGAGED
HAS
RISING EDGE
BEEN DETECTED AT
V
IGN
PIN
NO
YES
HAS
ACTIVITY BEEN DETECTED
AT BUS PIN
NO
YES
PRIMARY REGULATOR ENABLED;
V
DD
/V
SSD
CLAMP RELEASED;
REGULATOR OUTPUT AT V
DD
PINS RISES TOWARD 5 V
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| MC68HC05X4DW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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