MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 33

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

(4) Port Resistance Registers
Notes :
• Register configuration
• Block diagram
Port 0 resistance register (RDR0)
Port 1 resistance register (RDR1)
Port 6 resistance register (RDR6)
Input resistance register R/W
Controls the pull-up resistor in input mode.
The setting has no meaning in output mode (pull-up resistor disconnected).
The direction register (DDR) sets input or output mode.
The pull-up resistor is disconnected in hardware standby or stop mode (SPL = 1) (high impedance).
This function is disabled when using an external bus mode. In this case, do not write to this register.
0: Pull-up resistor disconnected in input mode.
1: Pull-up resistor connected in input mode.
Address : 00001C
Address : 00001D
Address : 00001E
R/W : Readable and writable
Resistance register
Direction register
H
H
H
Data register
RD07 RD06 RD05 RD04 RD03 RD02 RD01 RD00
RD17 RD16 RD15 RD14 RD13 RD12 RD11 RD10
RD67 RD66 RD65 RD64 RD63 RD62 RD61 RD60
bit 7
bit 7
bit 7
bit 6
bit 6
bit 6
bit 5
bit 5
bit 5
bit 4
bit 4
bit 4
bit 3
bit 3
bit 3
MB90650A Series
Pull-up resistor (approx. 50 k )
bit 2
bit 2
bit 2
bit 1
bit 1
bit 1
Port I/O
bit 0
bit 0
bit 0
Initial value Access
0 0 0 0 0 0 0 0
Initial value Access
0 0 0 0 0 0 0 0
Initial value Access
0 0 0 0 0 0 0 0
B
B
B
R / W
R / W
R / W
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