XC68HC705JJ7 Motorola, XC68HC705JJ7 Datasheet - Page 148
XC68HC705JJ7
Manufacturer Part Number
XC68HC705JJ7
Description
MICROCONTROLLER
Manufacturer
Motorola
Datasheet
1.XC68HC705JJ7.pdf
(242 pages)
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Simple Synchronous Serial Interface
9.4.2 SIOP Status Register
Advance Information
148
Address:
The SIOP status register (SSR) is located at address $000B and
contains two read-only bits.
the register and indicates the value of each bit after reset.
SPIF — Serial Port Interrupt Flag
DCOL — Data Collision Bit
Reset:
Read:
Write:
The SPIF is a read-only status bit that is set on the last rising edge of
SCK and indicates that a data transfer has been completed. It has no
effect on any future data transfers and can be ignored. The SPIF bit
can be cleared by reading the SSR followed by a read or write of the
SDR or by writing a logic 1 to the SPIR bit in the SCR. If the SPIF is
cleared before the last rising edge of SCK it will be set again on the
last rising edge of SCK. Reset clears the SPIF bit.
The DCOL is a read-only status bit which indicates that an illegal
access of the SDR has occurred. The DCOL bit will be set when
reading or writing the SDR after the first falling edge of SCK and
before SPIF is set. Reading or writing the SDR during this time will
result in invalid data being transmitted or received. The DCOL bit is
cleared by reading the SSR (when the SPIF bit is set) followed by a
read or write of the SDR. If the last part of the clearing sequence is
1 = Serial transfer complete, serial interrupt if the SPIE bit in SCR
0 = Serial transfer in progress or serial interface idle
$000B
SPIF
Simple Synchronous Serial Interface
Bit 7
is set
0
Figure 9-5. SIOP Status Register (SSR)
= Unimplemented
DCOL
6
0
5
0
0
Figure 9-5
MC68HC705JJ7 • MC68HC705JP7 — REV 4
4
0
0
shows the position of each bit in
3
0
0
2
0
0
1
0
0
MOTOROLA
Bit 0
0
0
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