MC9S08AW32CFGE Freescale, MC9S08AW32CFGE Datasheet - Page 49
MC9S08AW32CFGE
Manufacturer Part Number
MC9S08AW32CFGE
Description
Manufacturer
Freescale
Datasheet
1.MC9S08AW32CFGE.pdf
(324 pages)
Specifications of MC9S08AW32CFGE
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
40MHz
Interface Type
I2C/SCI/SPI
Total Internal Ram Size
2KB
# I/os (max)
34
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
LQFP
Program Memory Type
Flash
Program Memory Size
32KB
Lead Free Status / RoHS Status
Compliant
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$FFB0 –
$FFB7
$FFB8 –
$FFBB
$FFBC
$FFBD
$FFBE
$FFBF
Provided the key enable (KEYEN) bit is 1, the 8-byte comparison key can be used to temporarily
disengage memory security. This key mechanism can be accessed only through user code running in secure
memory. (A security key cannot be entered directly through background debug commands.) This security
key can be disabled completely by programming the KEYEN bit to 0. If the security key is disabled, the
only way to disengage security is by mass erasing the FLASH if needed (normally through the background
debug interface) and verifying that FLASH is blank. To avoid returning to secure mode after the next reset,
program the security bits (SEC01:SEC00) to the unsecured state (1:0).
4.3
The MC9S08AW60 Series includes static RAM. The locations in RAM below $0100 can be accessed
using the more efficient direct addressing mode, and any single bit in this area can be accessed with the bit
manipulation instructions (BCLR, BSET, BRCLR, and BRSET). Locating the most frequently accessed
program variables in this area of RAM is preferred.
The RAM retains data when the MCU is in low-power wait, stop2, or stop3 mode. At power-on, the
contents of RAM are uninitialized. RAM data is unaffected by any reset provided that the supply voltage
does not drop below the minimum value for RAM retention.
For compatibility with older M68HC05 MCUs, the HCS08 resets the stack pointer to $00FF. In the
MC9S08AW60 Series, it is usually best to re-initialize the stack pointer to the top of the RAM so the direct
page RAM can be used for frequently accessed RAM variables and bit-addressable program variables.
Include the following 2-instruction sequence in your reset initialization routine (where RamLast is equated
to the highest address of the RAM in the Freescale-provided equate file).
Freescale Semiconductor
Address
NVBACKKEY
Reserved
Reserved for stor-
age of 250 kHz
ICGTRM value
NVPROT
Reserved for stor-
age of 243 kHz
ICGTRM value
NVOPT
RAM
Register Name
LDHX
TXS
#RamLast+1
KEYEN
FPS7
Bit 7
—
—
—
Table 4-4. Nonvolatile Register Summary
FNORED
FPS6
MC9S08AW60 Data Sheet, Rev 2
—
—
—
6
;point one past RAM
;SP<-(H:X-1)
FPS5
—
—
—
5
0
8-Byte Comparison Key
FPS4
—
—
—
4
0
FPS3
—
—
—
3
0
FPS2
—
—
—
2
0
SEC01
FPS1
—
—
—
1
Chapter 4 Memory
SEC00
FPDIS
Bit 0
—
—
—
49
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