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ST6255CB3 数据表(PDF) 25 Page - STMicroelectronics

部件名 ST6255CB3
功能描述  8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI
PDF  86 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST6255CB3 数据表(HTML) 25 Page - STMicroelectronics

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ST62T55C ST62T65C/E65C
RESETS (Cont’d)
3.2.6 MCU Initialization Sequence
When a reset occurs the stack is reset, the PC is
loaded with the address of the Reset Vector (locat-
ed in program ROM starting at address 0FFEh). A
jump to the beginning of the user program must be
coded at this address. Following a Reset, the In-
terrupt flag is automatically set, so that the CPU is
in Non Maskable Interrupt mode; this prevents the
initialisation routine from being interrupted. The in-
itialisation routine should therefore be terminated
by a RETI instruction, in order to revert to normal
mode and enable interrupts. If no pending interrupt
is present at the end of the initialisation routine, the
MCU will continue by processing the instruction
immediately following the RETI instruction. If, how-
ever, a pending interrupt is present, it will be serv-
iced.
Figure 15. Reset and Interrupt Processing
Figure 16. Reset Block Diagram
RESET
RESET
VECTOR
JP
JP:2 BYTES/4 CYCLES
RETI
RETI: 1 BYTE/2 CYCLES
INITIALIZATION
ROUTINE
VA00181
VDD
RESE T
RPU
RESD
1)
POWER
WATCHD OG RESET
CK
COUNTER
RESET
ST6
INTERNA L
RESET
fOSC
RESE T
ON RESET
LVD RESET
VR02107A
AND. Wired
1) Resistive ESD protection. Value not guaranteed.
25



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