XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 313
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
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MC68HC908AZ60A — Rev 2.0
MOTOROLA
Address:
SPRF — SPI Receiver Full Bit
ERRIE — Error Interrupt Enable Bit
OVRF — Overflow Bit
Reset:
Read:
Write:
This clearable, read-only flag is set each time a byte transfers from
the shift register to the receive data register. SPRF generates a CPU
interrupt request if the SPRIE bit in the SPI control register is set also.
During an SPRF CPU interrupt, the CPU clears SPRF by reading the
SPI status and control register with SPRF set and then reading the
SPI data register. Any read of the SPI data register clears the SPRF
bit.
Reset clears the SPRF bit.
This read-only bit enables the MODF and OVRF flags to generate
CPU interrupt requests. Reset clears the ERRIE bit.
This clearable, read-only flag is set if software does not read the byte
in the receive data register before the next byte enters the shift
register. In an overflow condition, the byte already in the receive data
register is unaffected, and the byte that shifted in last is lost. Clear the
OVRF bit by reading the SPI status and control register with OVRF set
and then reading the SPI data register. Reset clears the OVRF flag.
Figure 19-12. SPI Status and Control Register (SPSCR)
1 = Receive data register full
0 = Receive data register not full
1 = MODF and OVRF can generate CPU interrupt requests
0 = MODF and OVRF cannot generate CPU interrupt requests
1 = Overflow
0 = No overflow
$0011
SPRF
Bit 7
R
0
Serial Peripheral Interface (SPI)
= Reserved
ERRIE
6
0
OVRF
5
0
MODF
4
0
= Unimplemented
SPTE
3
1
Serial Peripheral Interface (SPI)
MODFEN
2
0
SPR1
1
0
Technical Data
I/O Registers
SPR0
Bit 0
0
313
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