MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 269

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MC68HC705B16CFN

Manufacturer Part Number
MC68HC705B16CFN
Description
IC MCU 2.1MHZ 15K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705B16CFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
15KB (15K x 8)
Program Memory Type
OTP
Eeprom Size
256 x 8
Ram Size
352 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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H.5.3
This mode is similar to the RAM load/execute program for the MC68HC05B6 described in
Section
required for this mode.
If the first byte is less than $B0, the bootloader behaves exactly as the MC68HC05B6, i.e. count
byte followed by data stored in $0050 to $00FF. If the count byte is larger than RAM I (176 bytes)
then the code continues to fill RAM II then RAM III. In this case the count byte is ignored and the
program execution begins at $0051 once the total RAM area is filled or if no data is received for 5
milliseconds.
The user must take care when using branches or jumps as his code will be relocated in RAM I, II
and III. If the user intends to use the stack in his program, he should send NOP’s to fill the desired
stack area.
In the RAM bootloader mode, all interrupt vectors are mapped to pseudo-vectors in RAM (see
Table
pseudo-vector is allowed three bytes of space rather than the two bytes for normal vectors,
because an explicit jump (JMP) opcode is needed to cause the desired jump to the users
service-routine address.
H.5.3.1
The Jump to start of RAM program will be executed when bring the device out of reset with PD2
and PD3 at ‘1’ and PD4 at ‘0’.
MC68HC05B6
Rev. 4.1
H-5). This allows programmers to use their own service-routine addresses. Each
2.2, with the additional features listed below.
Serial RAM loader
Jump to start of RAM ($0051)
Table H-5 Bootstrap vector targets in RAM
SCI interrupt
Timer overflow
Timer output compare
Timer input capture
IRQ
SWI
Vector targets in RAM
MC68HC705B32
$005D
$005A
$0063
$0060
$0057
$0054
Table H-4
shows the entry conditions
Freescale
H-19
14

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