PIC16C57C-04/SP【PDF 120/194 页】IC MCU OTP 2KX12 28DIP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3872

116页 117页 118页 119页 [120页]121页 122页 123页 124页

2002 Microchip Technology Inc.

Preliminary

DS30453D-page 29

PIC16C5X

6.3

STATUS Register

This register contains the arithmetic status of the ALU,

the RESET status and the page preselect bits for pro-

gram memories larger than 512 words.

The STATUS Register can be the destination for any

instruction, as with any other register. If the STATUS

the Z, DC or C bits, then the write to these three bits is

disabled. These bits are set or cleared according to the

device logic. Furthermore, the TO and PD bits are not

writable. Therefore, the result of an instruction with the

STATUS Register as destination may be different than

intended.

For example, CLRF STATUS will clear the upper three

bits and set the Z bit. This leaves the STATUS Register

as 000u u1uu (where u = unchanged).

It is recommended, therefore, that only BCF, BSF and

MOVWF

instructions be used to alter the STATUS Reg-

ister because these instructions do not affect the Z, DC

or C bits from the STATUS Register. For other instruc-

tions which do affect STATUS Bits, see Section 10.0,

Instruction Set Summary.

REGISTER 6-1:

STATUS REGISTER (ADDRESS: 03h)

R/W-0

R-1

R/W-x

PA2

PA1

PA0

ZDC

bit 7

bit 0

bit 7:

PA2: This bit unused at this time.

Use of the PA2 bit as a general purpose read/write bit is not recommended, since this may affect upward

compatibility with future products.

bit 6-5:

PA<1:0>: Program page preselect bits (PIC16C56/CR56)(PIC16C57/CR57)(PIC16C58/CR58)

= Page 0 (000h - 1FFh) - PIC16C56/CR56, PIC16C57/CR57, PIC16C58/CR58

= Page 1 (200h - 3FFh) - PIC16C56/CR56, PIC16C57/CR57, PIC16C58/CR58

= Page 2 (400h - 5FFh) - PIC16C57/CR57, PIC16C58/CR58

= Page 3 (600h - 7FFh) - PIC16C57/CR57, PIC16C58/CR58

Each page is 512 words.

Using the PA<1:0> bits as general purpose read/write bits in devices which do not use them for program

page preselect is not recommended since this may affect upward compatibility with future products.

bit 4:

TO: Time-out bit

= After power-up, CLRWDT instruction, or SLEEP instruction

= A WDT time-out occurred

bit 3:

PD: Power-down bit

= After power-up or by the CLRWDT instruction

= By execution of the SLEEP instruction

bit 2:

Z: Zero bit

= The result of an arithmetic or logic operation is zero

= The result of an arithmetic or logic operation is not zero

bit 1:

DC: Digit carry/borrow bit (for ADDWF and SUBWF instructions)

ADDWF

= A carry from the 4th low order bit of the result occurred

= A carry from the 4th low order bit of the result did not occur

SUBWF

= A borrow from the 4th low order bit of the result did not occur

= A borrow from the 4th low order bit of the result occurred

bit 0:

C: Carry/borrow bit (for ADDWF, SUBWF and RRF, RLF instructions)

ADDWF

SUBWF

RRF or RLF

= A carry occurred

= A borrow did not occur

Loaded with LSb or MSb, respectively

= A carry did not occur

= A borrow occurred

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

1 = bit is set

0 = bit is cleared

x = bit is unknown

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式