November, 2018 Rev.1.4
33
8. MEMORY
The MC96FR364B has separate address spaces for Program and Data Memory. The logical
separation of Program and Data Memory allows the Data Memory to be accessed by 8-bit addresses,
which can be more quickly stored and manipulated by an 8-bit CPU. Nevertheless, 16-bit Data
Memory addresses can also be generated through the DPTR register.
Program Memory contains user software and is read-only while the device is in normal running mode.
But the Program Memory can be erased or programmed by ISP(In System Programming) method.
The MC96FR364B can assign maximum 64KB. Data Memory is composed of Internal RAM (IRAM),
External RAM (XRAM). IRAM is read-writable and address space is 256B including Stack Pointer.
XRAM has 1792B of memory depth and also read-writable.
NOTE
The terms IRAM and XRAM are used just to classify kind of memory. XRAM doesn’t have to reside outside
the device. In MC96FR364B, both IRAM and XRAM reside in device.
8.1 Program Memory
A 16-bit program counter is capable of addressing up to 64K bytes. The following figure shows a map
of program memory in MC96FR364B. After reset, the CPU begins program execution from address
0000
H
. All interrupt vector is assigned to their fixed location in program memory. An interrupt causes
the CPU to jump to it’s vector location, where the CPU commences execution of the service routine.
External interrupt 0, for example, is assigned to location 000B
H
. If user wants to use external interrupt
0 as an interrupt source, its service routine must begin at location 000B
H
. If the interrupt is not used,
its service location is available as general purpose program memory. Because all interrupt vector can
use 8 bytes from each vector address
NOTE
, the service routine can reside entirely within that 8 bytes if
an interrupt service routine is short enough (as is often the case in control applications). Normally an
interrupt service routine is longer than 8 bytes, so the service routine starts with a jump instruction.
NOTE
Refer to Table 10-2 Interrupt Vector Address.
0000
H
FFFF
H
64KB
Bank0
Figure 8-1 Program Memory
Summary of Contents for MC96FR364B
Page 17: ...MC96FR364B November 2018 Rev 1 4 17 4 PACKAGE DIMENSION...
Page 18: ...MC96FR364B 18 November 2018 Rev 1 4 Figure 4 1 PKG DIMENSION 28 TSSOP...
Page 23: ...MC96FR364B November 2018 Rev 1 4 23 6 3 REMOUT Port Data PAD VDD Figure 6 3 REMOUT port...
Page 69: ...November 2018 Rev 1 4 69 Initial value 00H BIT 7 0 BIT counter value...
