159
MC96F8204
ABOV Semiconductor Co., Ltd.
The Checksum operation
procedure in Auto CRC/Checksum mode
1.
Global interrupt Disable (EA = 0)
2.
Select Auto CRC/Checksum Mode and Checksum
3.
Select CRC Clock
4.
Set CRC start address register (FCSARH/FCSARM/FCSARL)
5.
Set CRC end address register (FCEARH/FCEARM/FCEARL)
6.
CRC operation starts (CRCRUN = 1)
7.
Read the Checksum result
8.
Global interrupt Enable (EA = 1)
Program Tip
–
Auto CRC/Checksum mode
//****
Global
interrupt Disable
EA = 0;
//**** Flash CRC Auto CRC/Checksum Mode and Checksum
FCCR &= _0111_1111;
FCCR |= _0010_0000;
// Checksum mode
OSCCR &= _1111_1011;
// IRC Enable
FCCR &= _1111_0001;
// CRC clk = fIRC/1
//**** Checksum start address set
FCSARH = 0x00;
FCSARM = 0x00;
FCSARL = 0x00;
//**** Checksum end address set
FCEARH = 0x00;
FCEARM = 0x3F;
FCEARL = 0xFF;
//**** Checksum start
FCCR |= _0000_0001;
_nop_();
//Dummy instruction, This instruction must be needed.
_nop_();
//Dummy instruction, This instruction must be needed.
_nop_();
//Dummy instruction, This instruction must be needed.
//**** Read Checksum result
Temp0 = FCDRH;
Temp1 = FCDRL;
//****
Global
interrupt Enable
EA = 1;
NOTE)
1. Three or more NOP instructions must immediately follow the Checksum start operation in auto
CRC/Checksum mode.
2. During a Checksum operation(when CRCRUN bit is Running state) in auto CRC/Checksum mode, the
CPU is hold and the global interrupt is on disable state regardless of the IE.7 (EA) bit. But should be set
the global interrupt is disabled (EA = 0) before the Checksum operation is started in use auto
CRC/Checksum mode, recommend.
Summary of Contents for MC96F8204 Series
Page 13: ...13 MC96F8204 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 20 Pin SOP Package...
Page 14: ...14 MC96F8204 ABOV Semiconductor Co Ltd Figure 4 2 20 Pin TSSOP Package...
Page 15: ...15 MC96F8204 ABOV Semiconductor Co Ltd Figure 4 3 16 Pin SOPN Package...
Page 16: ...16 MC96F8204 ABOV Semiconductor Co Ltd Figure 4 4 10 Pin SSOP Package...
Page 17: ...17 MC96F8204 ABOV Semiconductor Co Ltd Figure 4 5 8 Pin SOP Package...
