MC68SEC000AA16 Freescale Semiconductor, MC68SEC000AA16 Datasheet - Page 218

• Manufacturer Part Number: MC68SEC000AA16
• Description: IC MPU 32BIT 16MHZ 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: M68000r

Specifications of MC68SEC000AA16

• Processor Type: M680x0 32-Bit
• Speed: 16MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 64-QFP
• Processor Series: M680xx
• Core: CPU32
• Maximum Clock Frequency: 16 MHz
• Operating Supply Voltage: 3.3 V, 5 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Core Size: 32 Bit
• Cpu Speed: 16MHz
• Digital Ic Case Style: QFP
• No. Of Pins: 64
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Frequency Typ: 20MHz
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Clock Frequency: 16MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Common Bootstrap Mode Problems
8491 '*
8492 '*
8493 '*
8494 '************************************************************************
8500 IF K > 255 THEN HX$="Too big":GOTO 8530
8510 HX$=MID$(H$,K\16+1,1)
8520 HX$=HX$+MID$(H$,(K MOD 16)+1,1)
8530 RETURN
9499 '******************** BOOT CODE ****************************************
9500 DATA 86, 23
9510 DATA B7, 10, 02
9520 DATA 86, FE
9530 DATA B7, 10, 03
9540 DATA C6, FF
9550 DATA F7, 10, 07
9560 DATA CE, 0F, A0
9570 DATA 18, CE, E0, 00
9580 DATA 7E, BF, 00
9590 '***********************************************************************
Common Bootstrap Mode Problems
It is not unusual for a user to encounter problems with bootstrap mode because it is new to many users.
By knowing some of the common difficulties, the user can avoid them or at least recognize and quickly
correct them.
Reset Conditions vs. Conditions as Bootloaded Program Starts
It is common to confuse the reset state of systems and control bits with the state of these systems and
control bits when a bootloaded program in RAM starts.
Between these times, the bootloader program is executed, which changes the states of some systems
and control bits:
Users also forget that bootstrap mode is a special mode. Thus, privileged control bits are accessible, and
write protection for some registers is not in effect. The bootstrap ROM is in the memory map. The DISR
bit in the TEST1 control register is set, which disables resets from the COP and clock monitor systems.
Since bootstrap is a special mode, these conditions can be changed by software. The bus can even be
switched from single-chip mode to expanded mode to gain access to external memories and peripherals.
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The SCI system is initialized and turned on (Rx and Tx).
The SCI system has control of the PD0 and PD1 pins.
Port D outputs are configured for wire-OR operation.
The stack pointer is initialized to the top of RAM.
Time has passed (two or more SCI character times).
Timer has advanced from its reset count value.
DECIMAL TO HEX CONVERSION
INPUT:
OUTPUT: HX$ - TWO CHARACTER STRING WITH HEX CONVERSION
M68HC11 Bootstrap Mode, Rev. 1.1
K - INTEGER TO BE CONVERTED
'LDAA
'STAA
'LDAA
'STAA
'LDAB
'STAB
'LDX
'LDY
'JMP
'UPPER NIBBLE
'LOWER NIBBLE
#$23
OPT2
#$FE
PORTC
#$FF
DDRC
#4000
#$E000
$BF00
make port C wire or
light 1 LED on port C bit 0
make port C outputs
2msec at 2MHz
Start of BUFFALO 3.4
EPROM routine start address
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