C8051F045 查看數據表（PDF） - Silicon Laboratories

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C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

SFR Definition 12.3. SFR Next Register: SFRNEXT

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Reset Value

00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Address: 0x85

SFR Page: All Pages

Bits7-0:

SFR page context is retained upon interrupts/return from interrupts in a 3 byte SFR Page

Stack: SFRPAGE is the first entry, SFRNEXT is the second, and SFRLAST is third entry.

The SFRPAGE, SFRSTACK, and SFRLAST bytes may be used alter the context in the SFR

Page Stack. Only interrupts and returns from interrupt service routines push and pop the

SFR Page Stack. (See Section 12.2.6.2 and Section 12.2.6.3 for further information.)

Write:

Sets the SFR Page contained in the second byte of the SFR Stack. This will cause the

SFRPAGE SFR to have this SFR page value upon a return from interrupt.

Read:

Returns the value of the SFR page contained in the second byte of the SFR stack. This is

the value that will go to the SFR Page register upon a return from interrupt.

SFR Definition 12.4. SFR Last Register: SFRLAST

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Reset Value

00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Address: 0x86

SFR Page: All Pages

Bits7-0:

SFR page context is retained upon interrupts/return from interrupts in a 3 byte SFR Page

Stack: SFRPAGE is the first entry, SFRNEXT is the second, and SFRLAST is the third

entry. The SFR stack bytes may be used alter the context in the SFR Page Stack, and will

not cause the stack to ‘push’ or ‘pop’. Only interrupts and returns from the interrupt service

routine push and pop the SFR Page Stack.

Write:

Sets the SFR Page in the last entry of the SFR Stack. This will cause the SFRNEXT SFR to

have this SFR page value upon a return from interrupt.

Read:

Returns the value of the SFR page contained in the last entry of the SFR stack.

Rev. 1.5

143

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