XC2000 datasheet(39/110 Pages) INFINEON

39 / 110 page

XC2287 / XC2286 / XC2285

XC2000 Family Derivatives

Functional Description

Preliminary

Data Sheet

V0.91, 2007-02

Draft Version

1024 bytes (2

× 512 bytes) of the address space are reserved for the Special Function

used for controlling and monitoring functions of the different on-chip units. Unused SFR

addresses are reserved for future members of the XC2000 Family. Therefore, they

should either not be accessed, or written with zeros, to ensure upward compatibility.

In order to meet the needs of designs where more memory is required than is provided

on chip, up to 12 Mbytes (approximately, see Table 3) of external RAM and/or ROM can

be connected to the microcontroller. The External Bus Interface also provides access to

external peripherals.

Up to 768 Kbytes of on-chip Flash memory store code, constant data, and control

data. The on-chip Flash memory consists of up to 3 modules with a maximum capacity

of 256 Kbytes each. Each module is organized in 4-Kbyte sectors. One 4-Kbyte sector

of Flash module 0 is used internally to store operation control parameters and protection

information.

Note: The actual size of the Flash memory depends on the chosen derivative (see

Table 1).

Each sector can be separately write protected

1), erased and programmed (in blocks of

128 Bytes). The complete Flash area can be read-protected. A user-defined password

sequence temporarily unlocks protected areas. The Flash modules combine 128-bit

read accesses with protected and efficient writing algorithms for programming and

erasing. Dynamic error correction provides extremely high read data security for all read

accesses. Accesses to different Flash modules can be executed in parallel.

For timing characteristics, please refer to Section 4.4.2, for further Flash parameters,

please refer to Section 5.3.

1) To save control bits, sectors are clustered for protection purposes, they remain separate for

programming/erasing.

XC2000 Datasheet(PDF) 39 Page - Infineon Technologies AG