CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
464
Figure 19-19. Timing of INTIE2 Interrupt Generation in Locked State (for (3))
INTIE2
IEBus sequence
Status
interrupt
Start
Master address
(12 + P)
Broad-
casting
Slave address
(12 + P + A)
Control
(4 + P + A)
Telegraph length
(8 + P + A)
Communication
complete interrupt
Data
(8 + P + A)
Start
interrupt
Remark
P: Parity bit, A: ACK/NACK bit
(6) IEBus telegraph length register (DLR)
(a) When transmission unit ... Master transmission, slave transmission
The data of this register is reflected in the data transmitted in the telegraph length field and indicates the
number of bytes of the transmit data.
This register must be set in advance before transmission.
(b) When reception unit ... Master reception, slave reception
The receive data in the telegraph length field transmitted from the transmission unit is written to this
register.
Remark
The IEBus telegraph length register consists of a write register and a read register.
Consequently, data written to this register cannot be read as is. The data that can be read is
the data received during IEBus communication.