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| C541U Datasheet, PDF (42/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER | |||
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C541U
Basic Programming Mode Selection
The basic programming mode selection scheme is shown in figure 21.
VDD
Clock
(XTAL1/XTAL2)
RESET
PSEN
PMSEL1,0
PROG
PRD
PSEL
PALE
EA/VPP
stable
â1â
â0â
0,1
â0â
â1â
â0â
0V
During this period signals
are not actively driven
5V
VPP
VIH1
Ready for access
mode selection
Figure 21
Basic Programming Mode Selection
Semiconductor Group
40
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