M68HC11K Datasheet, PDF (79/290 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Operating Modes and On-Chip Memory
Operating Modes
Table 4-2. Synchronization Character Selection
Synchronization
Character
$FF
$FF
$F0
$FD
Timeout
Delay
4 characters
4 characters
4.9 characters
13 characters
Baud Rate at E Clocks
2 MHz
3 MHz
4 MHz
7812
11,718
15,624
1200
1800
2400
9600
14,400 19,200
3906
5859
7812
For a detailed description of bootstrap mode, refer to the Motorola
application note entitled MC68HC11 Bootstrap Mode, document order
number AN1060/D.
4.5.4 Special Test Mode
Special test mode, a variation of the expanded mode, is used primarily
during Motorola’s internal production testing. However, for those devices
containing EPROM, it can be used to program the EPROM for program
calibration data in EEPROM and support emulation and debugging
during development.
For more detailed information, refer to 4.7.1 Programming the EPROM
with Downloaded Data.
4.5.5 Mode Selection
The operating mode is selected by applying the appropriate logic states
to the MODA and MODB pins during reset. MODA selects single-chip
mode (0) or expanded mode (1). A logic high on MODB selects normal
modes, and vectors are fetched from memory area $FFC0–$FFFF. A
logic low on MODB selects special modes, and reset vectors are fetched
from memory area $BFC0–$BFFF. Values reflecting the selected mode
are latched into the RBOOT, SMOD, and MDA bits of the highest priority
I-bit interrupt and miscellaneous register (HPRIO) on the rising edge of
RESET.
M68HC11K Family
MOTOROLA
Operating Modes and On-Chip Memory
For More Information On This Product,
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Technical Data
79