HD6433935 Hitachi, HD6433935 Datasheet - Page 259

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

Bit 7: Reserved bit
Bits 7 is reserved; it is always read as 1 and cannot be modified.
Bit 6: Extension data bit (SOL)
The SOL bit changes the output level of the SO
SO
and therefore the SO
transmission. However, the SOL bit setting becomes invalid when the next transmission starts*.
Therefore, when changing the SO
performed on the SOL bit each time transmission is completed. Writing to this register during data
transfer will cause incorrect operation, so this register should not be manipulated during
transmission.
Note: * The SOL bit setting is also invalid in SSB mode.
Bit 6
SOL
0
1
Bit 5: Overrun error flag (ORER)
Bit 5 indicates that an overrun error has occurred when using an external clock. If extra pulses are
superimposed on the regular serial clock due to extraneous noise, etc., the transfer data cannot be
guaranteed. If the clock is input after transfer is completed, this will be interpreted as an overrun
state and this bit will be set to 1.
Bit 5
ORER
0
1
Bits 4 to 2: Reserved bits
Bits 4 to 2 are reserved; they are always read as 1 and cannot be modified.
1
. After transfer is completed, SO
Description
Read
Write
Read
Write
Description
Clearing conditions:
After reading ORER = 1, cleared by writing 0 to ORER
Setting conditions:
When an external clock is used and the clock is input after transfer is completed
1
output level can be changed by manipulating this bit before or after
SO
Changes SO
SO
Changes SO
1
1
output level is low
output level is high
1
output level after transmission, a write operation must be
1
output retains the value of the last bit of the transmit data,
1
1
output to low level
output to high level
1
. When read, SOL returns the output level of the
(initial value)
(initial value)
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