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MB90420/5 (A) SERIES F
2
n Operation of EI
OS
Figure 6.12 shows the operation of the EI
By IOA
CPU
(3)
(3)
By BAP
(4)
2
ISD : EI
OS descriptor
IOA : I/O address pointer
BAP : Buffer address pointer
2
ICS : EI
OS channel select bit of ICR
DCT : Data counter
(1) I/O Requests transfer.
(2) Interrupt controller selects descriptor.
(3) Transfer source and destination are read from descriptor.
(4) Transfer between I/O and memory is executed.
(5) Interrupt factor is cleared automatically.
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
2
OS.
Memory space
I/O Register
By ICS
ISD
(2)
By DCT
Buffer
Fig. 6.12 Operation of EI
6-24
Resource (I/O)
I/O register
Interrupt request
(1)
Interrupt control register (ICR)
Interrupt control
2
OS
(5)
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