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| S912XHZ512F1VAG Datasheet, PDF (39/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256 | |||
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Chapter 1 MC9S12XHZ Family Device Overview
EXTAL
MCU
C1
Crystal or
Ceramic Resonator
XTAL
C2
VSSPLL
Figure 1-7. Loop Controlled Pierce Oscillator Connections (PE7 = 0)
EXTAL
MCU
XTAL
RB
RS
C1
Crystal or
Ceramic Resonator
C2
VSSPLL
Figure 1-8. Full Swing Pierce Oscillator Connections (PE7 = 1)
EXTAL
MCU
XTAL
CMOS-Compatible
External Oscillator
Not Connected
Figure 1-9. External Clock Connections (PE7 = 1)
1.2.3.13 PE6 / MODB / TAGHI â Port E I/O Pin 6
PE6 is a general-purpose input or output pin. It is used as a MCU operating mode select pin during reset.
The state of this pin is latched to the MODB bit at the rising edge of RESET. This pin is an input with a
pull-down device which is only active when RESET is low. TAGHI is used to tag the high half of the
instruction word being read into the instruction queue.
The input voltage threshold for PE6 can be conï¬gured to reduced levels, to allow data from an external
3.3-V peripheral to be read by the MCU operating at 5.0 V. The input voltage threshold for PE6 is
conï¬gured to reduced levels out of reset in expanded and emulation modes.
MC9S12XHZ512 Data Sheet, Rev. 1.06
Freescale Semiconductor
39
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