MC68HC05F8 Datasheet, PDF (108/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
Table 12-2 Self-Check Report
PA3 PA2 PA1 PA0
1
1
1
1
1
1
1
0
1
1
0
1
1
1
0
0
1
0
1
1
1
0
1
0
1
0
0
1
1
0
0
0
0
1
1
1
Flashing
All Others
1=LED off; 0=LED on.
REMARKS
Faulty part, port A bad
Bad I/O
Bad RAM
Bad ROM
Bad Timer A
Bad Timer B
Bad SPI
Bad MANCD
Bad Interrupts
Good Device
Bad device, port A, etc.
12.3
Bootstrap Mode
The bootstrap mode is available on the MC68HC705F8 only, and it is a mean of self-programming
its EPROM with minimal circuitry. It is entered on the rising edge of RESET if IRQ1 pin is at 1.8V_DD
and TCAP is at logic one. RESET must be held low for 4064 cycles after POR (power-on reset) or
for a time t_RL for any other reset. Table 12-3 shows the options that are available once bootstrap
mode is entered. The execution result is indicated by two LEDs. The EPROM programming circuit
for bootstrap mode is shown in Figure 12-5.
Table 12-3 Bootstrap Mode Options
PB0
REMARKS
0
Program & Verify
1
Verify
12
12.3.1 EPROM Program Control Register
Address bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1
$3F
0
0
0
0
0
0
LAT
bit 0
EPGM
State
on reset
0000 0000
EPROM programming is controlled by the Program Control Register at location $3F.
MOTOROLA
12-4
OPERATING MODES
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TPG
MC68HC05F8