MOTOROLA
13-4
MC68HC05T16
OPERATING MODES
13
13.3
Bootstrap Mode
The bootstrap mode is provided in the EPROM part (MC68HC705T16) as a mean of
self-programming its EPROM with minimal circuitry. It is entered on the rising edge of RESET if
IRQ pin is at 1.8V
DD
and PC2 is at logic one. RESET must be held low for 4064 cycles after POR
(power-on reset).
13.3.1
EPROM Programming
The 4K-bytes OSD CHAR EPROM is positioned from $8000 to $8FFF, and the 23.5K-bytes user
EPROM is positioned from $A000 to $FDFF. The erased state of EPROM locations is $FF.
Programming boards are available from Motorola for programming the on-chip EPROM, please
contact your Motorola representative.
The Program Control register (PCR) is provided for EPROM programming. The function of the
EPROM depends on the device operating mode.
Please contact Motorola for Programming board availability.
13.3.2
Program Control Register (PCR)
Table 13-2 Self-Check Report
PA3
PA2
PA1
PA0
REMARKS
1
1
1
1
Faulty part, port A bad
1
1
1
0
Bad I/O
1
1
0
1
Bad RAM
1
1
0
0
Bad ROM
1
0
1
1
Bad TIMER
1
0
1
0
Bad PAC
1
0
0
1
Bad ADC
1
0
0
0
Bad OSD
0
1
1
1
Bad MFT
Flashing
Good Device
All Others
Bad Device, Bad Port A, etc.
1=LED off; 0=LED on.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$3D
ELAT
PGM
0000 0000
TPG
112
Summary of Contents for MC68HC05T16
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