MC68HC05B4 Datasheet, PDF (260/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

14
Preliminary ^Reset
IRQ at 2xV_DD? ^N
Y
TCAP1=V _DD? ^N
Y
Y
SEC bit active? ^N
Bootstrap mode
User mode
Non-user mode
Parallel E/EEPROM bootstrap
Erased EPROM verification
Y
PD3 set?
Y
SEC bit active?
Red LED on
N
N
Red LED on
Preliminary ^N
PD2 set?
Y
N
PD1 set?
Y
EPROM erased?
Y
N
Y
PD4 set?
N
Y
PD2 set?
N
Jump to RAM
($0051)
Serial RAM
load/execute
Non-user mode
Green LED on
Y
SEC bit active?
Red LED on
Preliminary ^{PD1 set?}
N
Erase EEPROM1
Red LED off
N
C
N
Y
PD4 set?
A
B
Figure H-3 Modes of operation flow chart (1 of 2)
MOTOROLA
H-14
MC68HC705B32
TPG
MC68HC05B6
Rev. 4