![](http://datasheet.mmic.net.cn/30000/MC68HC11E0CP3_datasheet_2369482/MC68HC11E0CP3_313.png)
A
N
1060
—
Rev
.1.0
MO
T
O
R
O
L
A
313
A
p
lic
a
tio
n
N
o
te
Table 2. Summary of Boot-ROM-Related Features
MCU Part
BOOT
ROM
Revision
(@$BFD1)
Mask Set
I.D.
(@$BFD2,3)
MCU Type
I.D.
(@$BFD4,5)
Security
Download
Length
JMP on
BRK or $00(1)
JMP
to RAM(2)
Default
RAM
Location
PROGRAM(3)
and UPLOAD(4)
Utility
Notes
MC68HC11A0
MC68HC11A1
MC68HC11A8
MC68SEC11A8
—
Mask set #
—
Yes
256
$B600
$0000
$0000–FF
—
(5)
MC68HC11D3
MC68HC711D3
$00
$42(B)
ROM I.D. #
$0000
$11D3
$71D3
—
0–192
$F000–ROM
$F000–EPROM
—
$0040–FF
—
Yes
(6)
MC68HC811E2
MC68SEC811E2
—
$0000
—
$E2E2
$E25C
—
Yes
256
$B600
$0000
$0000–FF
—
(5)
MC68HC11E0
MC68HC11E1
MC68HC11E9
MC68SEC11E9
—
ROM I.D. #
$E9E9
$E95C
—
Yes
0–512
$B600
—
$0000–1FF
—
(5)
MC68HC711E9
$41(A)
$0000
$71E9
—
0–512
$B600
—
$0000–1FF
Yes
MC68HC11F1
$42(B)
$0000
$F1F1
—
0–1024
$FE00
—
$0000–3FF
—
(6), (7)
MC68HC11K4
MC68HC711K4
$30(0)
$42(B)
ROM I.D. #
$0000
$044B
$744B
—
0–768
$0D80
—
$0080–37F
—
Yes
(6), (8)
1. By sending $00 or a break as the first SCI character after reset in bootstrap mode, a jump (JMP) is executed to the address in this table rather than doing
a download. Unless otherwise noted, this address is the start of EEPROM. Tying RxD to TxD and using a pullup resistor from TxD to VDD will cause the
SCI to see a break as the first received character.
2. If $55 is received as the first character after reset in bootstrap mode, a jump (JMP) is executed to the start of on-chip RAM rather than doing a download.
This $55 character must be sent at the default baud rate (7812 baud @ E = 2 MHz). For devices with variable-length download, the same effect can be
achieved by sending $FF and no other SCI characters. After four SCI character times, the download terminates, and a jump (JMP) to the start of RAM is
executed.
The jump to RAM feature is only useful if the RAM was previously loaded with a meaningful program.
3. A callable utility subroutine is included in the bootstrap ROM of the indicated versions to program bytes of on-chip EPROM with data received via the SCI.
4. A callable utility subroutine is included in the bootstrap ROM of the indicated versions to upload contents of on-chip memory to a host computer via the SCI.
5. The complete listing for this bootstrap ROM may be found in the M68HC11 Reference Manual, Motorola document order number M68HC11RM/AD.
6. The complete listing for this bootstrap ROM is available in the freeware area of the Motorola Web site.
7. Due to the extra program space needed for EEPROM security on this device, there are no pseudo-vectors for SCI, SPI, PAIF, PAOVF, TOF, OC5F,
or OC4F interrupts.
8. This bootloader extends the automatic software detection of baud rates to include 9600 baud at 2-MHz E-clock rate.