HD64570 Datasheet, PDF (97/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Section 4 Interrupt Controller
4.1 Overview
The SCA has a single INT signal line for sending interrupt requests to a host MPU. The INT
signal is generated by 20 interrupt sources on the SCA chip. Figure 4.1 shows the location of these
interrupt sources in the SCA's functional modules.
MSCI
(channel 0)
MSCI
(channel 1)
DMAC
(channel 0)
DMAC
(channel 1)
DMAC
(channel 2)
DMAC
(channel 3)
Timer
(channel 0)
Timer
(channel 1)
Timer
(channel 2)
Timer
(channel 3)
RXRDY0
TXRDY0
RXINT0
TXINT0
RXRDY1
TXRDY1
RXINT1
TXINT1
DMIA0
DMIB0
DMIA1
DMIB1
DMIA2
DMIB2
DMIA3
DMIB3
T0IRQ
Interrupt
control
(priority
decision
and
interrupt
enable/
disable
control)
INT
INTA
T1IRQ
T2IRQ
T3IRQ
Figure 4.1 Interrupt Sources
Rev. 0, 07/98, page 81 of 453