UPD784907 Datasheet, PDF (51/98 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784907, 784908
Figure 8-16. IEBus Controller
Internal register section
CPU interface section
8
12 12 12
8
8
8
8
8
8
8
8
BCR(8) UAR(12) SAR(12) PAR(12)
8
12 12 12
CDR(8)
8
DLR(8)
8
DR(8)
8
USR(8)
8
ISR(8)
8
SSR(8) SCR(8) CCR(8)
8
8
8
Internal bus
RX
NF
MPX
8
PSR (8 bits)
12
8
12-bit latch
TX/RX
Comparator
Interrupt
control
circuit
INT request
(vector, macro service)
TX
MPX
Parity error
detector
Conflict
detector
Interrupt control
section
IEBus interface section
ACK
generator
CLK
5 Internal bus R/W
Bit processing section
Field processing section
Data Sheet U11680EJ2V0DS00
51