XE8000EV108 Semtech, XE8000EV108 Datasheet - Page 24

• Manufacturer Part Number: XE8000EV108
• Description: EVAL BOARD FOR XE8806/XE8807
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV108

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC06AMI026
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.1
The XE8806A and XE8807A CPU are built with Harvard architecture. The Harvard architecture uses separate
instruction and data memories. The instruction bus and data bus are also separated. The advantage of such a
structure is that the CPU can fetch a new instruction and read/write data simultaneously. The circuit configuration is
shown in Figure 4-1. The CPU has its 16 internal registers. The instruction memory has a capacity of 8192 22-bit
instructions in the XE8806A and 4096 22-bit instructions in the XE8807A. The data memory space has 8 low power
registers, the peripheral register space and 512 bytes of RAM.
The CPU internal registers are described in the CPU chapter. A short reference of the low power registers and
peripheral registers is given in 4.2.
4.2
The data register map is given in the tables below. A more detailed description of the different registers is given in
the detailed description of the different peripherals.
The tables give the following information:
The reset source coding is given in Table 4-2. To get a full description of the reset sources, please refer to the
reset block chapter.
© Semtech 2006
0h1FFF
Instruction
1.
2.
3.
4.
XE8806A
8k x 22bit
XE8807A
4k x 22bit
capacity:
memory
Memory organisation
Quick reference data memory register map
The register name and register address
The different bits in the register
The access mode of the different bits (see Table 4-1 for code description)
The reset source and reset value of the different bits
stat
i0h
i1h
i2h
i3h
iph
Figure 4-1. Memory mapping
r0
r1
r2
r3
a
CPU
i0l
i1l
i2l
i3l
ipl
4-2
0h027F
0h0080
0h007F
0h0008
0h0000
data registers
Low power
XE8806A/XE8807A
Peripheral
512 bytes
capacity:
registers
RAM
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