MC68HC05B4 Datasheet, PDF (199/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

Reset
IRQ at 9V? ^N
Y
TCAP1 set? ^N
Y
Y
SEC bit active? ^N
User mode
Non-user mode
Bootstrap mode
Erased EPROM verification
A
Y _{PD4 set?} N
PD2 set? ^N
EPROM
erased?
Y _{Green LED on}
Y
N
Non-user mode
Red LED on ^N
EPROM not erased
PD1 set?
Y
B
Y _{PD3 set?}
N _{Parallel E/EEPROM bootstrap}
Program EPROM;
parallel load; green LED
flashes
Programming OK? ^Y
N
Red LED on
Green LED on
Bad EPROM programming EPROM verified
Bulk erase EEPROM1
Red LED on
N _{EEPROM1 erased?}
Y
Red LED off
Figure E-3 Modes of operation flow chart (1 of 2)
14
MC68HC05B6
Rev. 4
MC68HC705B16
TPG
MOTOROLA
E-11