Oki JOB60851 user manual Port 7 LED2 Control, Port 7 Registers

Chapter 4 Software Development

4-4. Port 7 LED2 Control

The MSM66Q573 microcontroller on the JOB60851 board has twelve bidirectional ports (P0 to P11) with 75 pins and an input only port (P12).

The Section describes the use of Port 7 (P7), the one connected to LED2.

4-4-1. Port 7 Registers

Each MSM66Q573 microcontroller port on the JOB60851 board has at least three control registers. The following describes those for Port 7.

(1)Port Mode Register (P7IO)

The bits in this register control the I/O directions of the corresponding Port 7 pins: input ("0") or output ("1"). After a reset, this register contains 00H, configuring all pins for input.

Port Mode Register (P7IO)

Bit number

P7IO

After a reset

bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
P7IO7	P7IO6	P7IO5	P7IO4	---	P7IO2	P7IO1	P7IO0
0	0	0	0	---	0	0	0

Setting a bit to "0" configures the corresponding Port 7 pin for input; "1" is for output.

(2)Port Secondary Function Control Register (P7SF)

The bits in this register switch between the primary ("0") and secondary ("1") functions of the corresponding Port 7 pins. After a reset, this register contains 00H, configuring all pins for their primary functions.

Port Secondary Function Control Register (P7SF)

Bit number		bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
	Primary	PWM1	PWM2	---	PTM3	---	---	TXD0	---
		OUT	OUT		OUT
P7SF
	Secondary	P7SF7	P7SF6	P7SF5	P7SF4	---	P7SF2	P7SF1	P7SF0
After a reset		0	0	0	0	---	0	0	0

Setting a bit to "0" configures the corresponding Port 7 pin for its primary function; "1" is for its secondary function.

Note that bit 0 has no secondary function because the corresponding pin is always a serial port receive data pin. To enable this input pin, simply write "0" to bit 0 in the Port Mode Register (P7IO).

(3)Data Port Register (P7)

The bits in this register hold the port's I/O data. After a reset, this register contains 00H.

Reading this register yields the input states of pins configured for input and the last data written for pins configured for output.

Writing to this register overwrites all bits regardless of pin I/O directions.

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