SAF-XC858CA-16FFI5V 查看數據表（PDF） - Infineon Technologies

零件编号

产品描述 (功能)

比赛名单

SAF-XC858CA-16FFI5V

8-Bit Single-Chip Microcontroller

Infineon Technologies 

XC858CA

Functional Description

SFR Address

(from CPU)

MOD_PAGE.PAGE

rw

SFR Data

(to/from CPU)

PAGE 0

SFR0

SFR1

SFRx

PAGE 1

SFR0

SFR1

SFRy

PAGE q

SFR0

SFR1

SFRz

Module

Figure 10 Address Extension by Paging

In order to access a register located in a page different from the actual one, the current

page must be exited. This is done by reprogramming the bit field PAGE in the page

register. Only then can the desired access be performed.

If an interrupt routine is initiated between the page register access and the module

register access, and the interrupt needs to access a register located in another page, the

current page setting can be saved, the new one programmed and the old page setting

restored. This is possible with the storage fields STx (x = 0 - 3) for the save and restore

action of the current page setting. By indicating which storage bit field should be used in

parallel with the new page value, a single write operation can:

• Save the contents of PAGE in STx before overwriting with the new value

(this is done in the beginning of the interrupt routine to save the current page setting

and program the new page number); or

Data Sheet

25

V1.0, 2010-03

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