Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 18 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIF)
R01UH0042EJ0500 Rev.5.00 Page 776 of 1513
Aug 12, 2011
18.5 Interrupt Request Signals
CSIFn can generate the following two types of interrupt request signals.
• Reception completion interrupt request signal (INTCFnR)
• Transmission enable interrupt request signal (INTCFnT)
Of these two interrupt request signals, the reception completion interrupt request signal has the higher priority by
default, and the priority of the transmission enable interrupt request signal is lower.
Table 18-2. Interrupts and Their Default Priority
Interrupt Priority
Reception complete High
Transmission enable Low
(1) Reception completion interrupt request signal (INTCFnR)
When receive data is transferred to the CFnRX register while reception is enabled, the reception completion
interrupt request signal is generated.
This interrupt request signal can also be generated if an overrun error occurs.
When the reception completion interrupt request signal is acknowledged and the data is read, read the CFnSTR
register to check that the result of reception is not an error.
In the single transfer mode, the INTCFnR interrupt request signal is generated upon completion of transmission,
even when only transmission is executed.
(2) Transmission enable interrupt request signal (INTCFnT)
In the continuous transmission or continuous transmission/reception mode, transmit data is transferred from the
CFnTX register and, as soon as writing to CFnTX has been enabled, the transmission enable interrupt request
signal is generated.
In the single transmission and single transmission/reception modes, the INTCFnT interrupt is not generated.