XE8805AMI028LF Semtech, XE8805AMI028LF Datasheet - Page 25

• Manufacturer Part Number: XE8805AMI028LF
• Description: IC DAS 16BIT FLASH 8K MTP 64LQFP
• Manufacturer: Semtech

Specifications of XE8805AMI028LF

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (22 kB)
• Controller Series: XE8000
• Ram Size: 512 x 8
• Interface: UART, USRT
• Number Of I /o: 24
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Supply Voltage Range: 2.4V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 64
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.1 Memory organisation
The XE8805 CPU is built with a 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 get 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. The data
memory space has 8 low power registers, the peripheral register space and 512 bytes of RAM.
µF µF
Figure 4-1. Memory mapping
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 Quick reference data memory register map
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
0h0000
Instruction
1.
2.
3.
4.
8k x 22bit
capacity:
memory
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
r0
r1
r2
r3
a
CPU
i0l
i1l
i2l
i3l
ipl
4-2
0h027F
0h0080
0h007F
0h0008
0h0000
Low power
Peripheral
512 bytes
capacity:
registers
RAM
RAM
XE8805/05A
www.semtech.com