MC9S08GT60ACFDE Freescale, MC9S08GT60ACFDE Datasheet - Page 50
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MC9S08GT60ACFDE
Manufacturer Part Number
MC9S08GT60ACFDE
Description
Manufacturer
Freescale
Datasheet
1.MC9S08GT60ACFDE.pdf
(302 pages)
Specifications of MC9S08GT60ACFDE
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
40MHz
Interface Type
I2C/SCI/SPI
Total Internal Ram Size
4KB
# I/os (max)
39
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
2.5/3.3V
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
1.8/2.08V
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
48
Package Type
QFN EP
Program Memory Type
Flash
Program Memory Size
60KB
Lead Free Status / RoHS Status
Compliant
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1
0xFFB0 –
0xFFB7
0xFFB8 –
0xFFBC
0xFFBD
0xFFBE
0xFFBF
Chapter 4 Memory
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 MC9S08GBxxA/GTxxA includes static RAM. The locations in RAM below 0x0100 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 or after
wakeup from stop1, 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 0x00FF. In the
MC9S08GBxxA/GTxxA, 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).
When security is enabled, the RAM is considered a secure memory resource and is not accessible through
BDM or through code executing from non-secure memory. See
description of the security feature.
4.4
The flash memory is intended primarily for program storage. In-circuit programming allows the operating
program to be loaded into the flash memory after final assembly of the application product. It is possible
50
Address
This location is used to store the factory trim value for the ICG.
NVBACKKEY
Reserved
NVPROT
Reserved
NVOPT
RAM
Flash
Register Name
LDHX
TXS
1
#RamLast+1
FPOPEN
KEYEN
Bit 7
—
—
—
Table 4-4. Nonvolatile Register Summary
FNORED
FPDIS
MC9S08GB60A Data Sheet, Rev. 2
—
—
—
6
;point one past RAM
;SP<-(H:X-1)
FPS2
—
—
—
5
0
8-Byte Comparison Key
FPS1
—
—
—
4
0
Section 4.5,
FPS0
—
—
—
3
0
“Security”
—
—
—
2
0
0
Freescale Semiconductor
SEC01
for a detailed
—
—
—
1
0
SEC00
Bit 0
—
—
—
0
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