MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 89

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

The MC68HC05BD3/MC68HC05BD5/ MC68HC705BD3 MCU has two modes of operation, the
User Mode and the Self-Check/ Bootstrap Mode. Figure 11-1 shows the flowchart of entry to these
two modes, and Table 11-1 shows operating mode selection.
MC68HC05BD3
OPERATING MODES
Figure 11-1 Flowchart of Mode Entering
RESET
SELF-CHECK/
BOOTSTRAP
PB5 = V
MODE
IRQ
?
Y
Y
DD
OPERATING MODES
9V
?
5V
11
N
Note:
Self-check mode is for MC68HC05BD3/BD5
Bootstrap mode is for MC68HC705BD3
(NORMAL MODE)
USER MODE
TPG
11-1
11