MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 63

• Manufacturer Part Number: MB90F654A
• Description: 16-bit Proprietary Microcontroller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

13. External Bus Pin Control Circuit
(1) Register Configuration
(2) Block Diagram
The external bus pin control circuit controls the external bus pins required to extend the CPU’s address/data bus
outside the device.
Auto-ready function selection register (ARSR)
External address output control register (HACR)
Bus control signal selection register (ECSR)
Access control
RB
—
Address : 0000A6
W
Address : 0000A5
Address : 0000A7
*
: Write only
: Unused
: “1” or “0”
Address control
Access control
Data control
P0 direction
P0 data
H
H
H
bit 15
ICR1
bit 15
CKE
W
W
E23
bit 7
W
bit 14
ICR0 HMR1 HMR0
bit 14
RYE
W
W
P0
bit 6
E22
W
P1
bit 13
bit 13
HDE
W
W
P2
bit 5
E21
W
P3
bit 12
bit 12
ICBS HMBS WRE LMBS
W
W
E20
bit 4
W
bit 11
bit 11
—
—
W
MB90650A Series
E19
bit 3
W
bit 10
bit 10
—
—
W
E18
bit 2
W
LMR1 LMR0
P0
bit 9
bit 9
W
W
E17
bit 1
W
bit 8
bit 8
—
W
—
bit 0
E16
W
P3
0 0 1 1 - - 0 0
0000*00-
00000000
Initial value
Initial value
Initial value
B
B
B
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