mc9s08jm60 Freescale Semiconductor, Inc, mc9s08jm60 Datasheet - Page 51
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mc9s08jm60
Manufacturer Part Number
mc9s08jm60
Description
Hcs08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08JM60.pdf
(386 pages)
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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 0x00FF. In the
MC9S08JM60 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).
LDHX
TXS
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
USB RAM is discussed in detail in
4.5
The flash memory is used 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 to program
the entire array through the single-wire background debug interface. Because no special voltages are
needed for flash erase and programming operations, in-application programming is also possible through
other software-controlled communication paths. For a more detailed discussion of in-circuit and
in-application programming, refer to the HCS08 Family Reference Manual, Volume I, Freescale
Semiconductor document order number HCS08RMv1.
4.5.1
Features of the flash memory include:
Freescale Semiconductor
•
•
•
•
•
•
•
Flash size
— MC9S08JM60 — 60,912 bytes (119 pages of 512 bytes each)
— MC9S08JM32 — 32,768 bytes (64 pages of 512 bytes each)
Single power supply program and erase
Command interface for fast program and erase operation
Up to 100,000 program/erase cycles at typical voltage and temperature
Flexible block protection
Security feature for flash and RAM
Auto power-down for low-frequency read accesses
USB RAM
Flash
#RamLast+1
Features
;point one past RAM
;SP<-(H:X-1)
MC9S08JM60 Series Data Sheet, Rev. 2
Chapter 17, “Universal Serial Bus Device Controller
Section 4.6,
“Security,” for a detailed
(S08USBV1).”
Chapter 4 Memory
51
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