mc68hc05jb4p Freescale Semiconductor, Inc, mc68hc05jb4p Datasheet - Page 22

• Manufacturer Part Number: mc68hc05jb4p
• Description: Mc68hc705jb4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

2.1
2.2
2.3
I/O AND CONTROL REGISTERS
The I/O and Control Registers reside in locations $0000 to $003F. The bit assign-
ments for each register are shown in Figure 2-2, Figure 2-3, Figure 2-4, and
Figure 2-5. Reading from unused bits will return unknown states, and writing to
unused bits will be ignored.
RAM
The user RAM consists of 176 bytes (including the stack) at locations $0080 to
$012F. The stack begins at address $00FF and proceeds down to $00C0. Using
the stack area for data storage or temporary work locations requires care to pre-
vent it from being overwritten due to stacking from an interrupt or subroutine call.
ROM
There are a total of 4k bytes of ROM on chip. This includes 3584 bytes of user
ROM with locations $1000 to $1DFF for user program storage and 16 bytes for
user vectors at locations $1FF0 to $1FFF. Also, 496 bytes of Self-check ROM on
chip at locations $1E00 to $1FEF.
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