73M2910L データシートの表示（PDF） - TDK Corporation

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73M2910L

Microcontroller

TDK Corporation 

73M2910L

Microcontroller

REGISTER DESCRIPTION (continued)

USR PROGRAMMABLE I/O

Port Control USR1, USR2, USR3, USR4, USR5

The core chip provides 32 user I/O pins. Each pin is programmed separately as either an input or as an output

by a bit in a direction register. If the bit in the direction register is set to a 1, the I/O control will treat the

corresponding pin as an input. If it is a 0, the pin will be treated as an output whose value is determined by the

port data register. The USR1 and USR2 port registers are accessed through the internal SFR bus. The USR3

and USR4 ports are accessed through the external memory bus by a MOVX instruction. The USR4 port

provides the user with an automatic chip select function if selected by the user. If the user does not require

some (or any) of the chip select pin options, he may program the USR4 port pins to operate in the same way as

USR3 port pins.

The USR Data Register contents determine pin values if chosen as an output. When reading from the data

register’s SFR address, the pin logic values are returned as data except when the port address is the

destination address for a read-modify-write instruction. In this case, the latched register values are returned as

data. When reading data from a data register that is mapped in the external memory space, the pin values are

always returned as data.

The USR5 Register allows for 2 additional input pins. In normal operation these pins can be used as general

purpose inputs. In power-down mode, the user can program either rising or falling transitions or logical

combinations of these pins to wake up the chip.

USR 1 PORT

USR1 DATA SFR Address 90h

Bit Addressable

Reset State 00h

BIT 7

USR1.7

BIT 6

USR1.6

BIT 5

USR1.5

BIT 4

USR1.4

BIT 3

USR1.3

BIT 2

USR1.2

BIT 1

USR1.1

BIT 0

USR1.0

Bits in this register will be asserted on the USR1(7:0) pins if the corresponding direction register bit is a 0.

Reading this SFR’s address will return data reflecting the values of pins USR1(7:0) except when address 90h is

the destination address for a read-modify-write instruction. In this case, the latched register values are returned

as data.

USR1 port signals are also used as timer controls. In applications where the external signals are required for

timer count modes, the corresponding port pin should be configured as an input.

USR1.0 bit

USR1.1 bit

USR1.2 bit

USR1.3 bit

= TIMER0 T0 PIN

= TIMER1 T1 PIN

= TIMER2 T2 EX PIN

= TIMER2 T2 PIN

USR1 Port Direction (DIR1) SFR Address 91h

Byte Addressable

Reset State FFh

BIT 7

DIR1.7

BIT 6

DIR1.6

BIT 5

DIR1.5

BIT 4

DIR1.4

BIT 3

DIR1.3

BIT 2

DIR1.2

BIT 1

DIR1.1

BIT 0

DIR1.0

This register is used to designate the USR1 pins as either inputs or outputs. If the register bit is reset to a 0, the

corresponding USR1 pin is programmed as an output that will be driven by the corresponding USR1 data

register bit. If the register bit is a 1, the corresponding pin will be treated as an input.

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