MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 27

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MC68HC705BD3

Manufacturer Part Number
MC68HC705BD3
Description
High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet

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The MC68HC05BD3/MC68HC705BD3/MC68HC05BD5 has a 16K-byte memory map consisting
of registers, user ROM/ EPROM , user RAM, self-check/ bootstrap ROM, and I/O as shown in
Figure 3-1.
3.1
All the I/O, control and status registers of the MC68HC05BD3 are contained within the first 48-byte
block of the memory map (address $0000 to $002F).
3.2
The user RAM consists of 128 bytes of memory, from $0080 to $00FF. This is shared with a 64
byte stack area. The stack begins at $00FF and counts down to $00C0.
3.3
The user RAM consists of 256 bytes of memory, from $0080 to $017F. This is shared with a 64
byte stack area. The stack begins at $00FF and counts down to $00C0.
Note:
MC68HC05BD3
Using the stack area for data storage or temporary work locations requires care to
prevent the data from being overwritten due to stacking from an interrupt or subroutine
call.
Registers
RAM (MC68HC05BD3)
RAM (MC68HC705BD3/MC68HC05BD5)
MEMORY AND REGISTERS
MEMORY AND REGISTERS
3
TPG
3-1
3

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