STN-34

Analog mission stick

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Contents

Mission Stick Manual

Ver1.00

■ Overview of analog mission stick

● 3-axis mode

The mission stick consists of a base unit and a removable stick unit.
The base unit is equipped with two stick connection terminals (stick # 1 and # 2), A, B, C, X, Y, X, L, R buttons and a start button, and connects to the Sega Saturn main unit. To do. The stick unit is equipped with a 3-axis (AX, AY, AZ) stick and triggers A, B, and C, and is connected to the stick # 1 terminal of the base unit.
For AX and AY, digital bits (Right, Left, Down, Up) are output.

● Caution

If you have only one stick, be sure to connect it to the stick # 1 terminal.

● 6-axis mode

6-axis mode can be set by connecting the optional stick (sold separately) to the stick # 2 terminal.
Digital bits (Right, Left, Down, Up) are output only to the stick connected to the stick # 1 terminal.
Further, the triggers A, B, C of the stick connected to the stick # 1 terminal are output to ATRG, BTRG, CTRG, and the triggers A, B, C of the stick connected to the stick # 2 terminal are XTRG, YTRG. It is output to ZTRG.

■ Mission Stick Data Format

● 3-axis mode peripheral ID

Saturn Peripheral Type: 1H (Analog Device)

Data size: 5H (5 bytes)

3-axis mode data format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Peripheral ID	0	0	0	1	0	1	0	1
1st data	Right	Left	Down	Up	Start	ATRG	CTRG	BTRG
2nd data	RTRG	XTRG	YTRG	ZTRG	LTRG	1	1	1
3rd data	AX7	AX6	AX5	AX4	AX3	AX2	AX1	AX0
4th data	AY7	AY6	AY5	AY4	AY3	AY2	AY1	AY0
5th data	AZ7	AZ6	AZ5	AZ4	AZ3	AZ2	AZ1	AZ0

• Start, ATRG, CTRG, BTRG, RTRG, XTRG, YTRG, ZTRG, LTRG will be 0 when the button is pressed.
• AX7 to AX0, AY7 to AY0, AZ7 to AZ0 output the absolute value of the A / D converter output without a sign.
• For AX7 to AX0 and AY7 to AY0, the upper left is (0,0) and the lower right is (255,255).
• For AZ7 to AZ0, the bottom is 0 and the top is 255.

Since the lower 3 bits [Bit2-0] = 111B of the 2nd data are reserved as future extension bits, programming that expects this value (111B) is prohibited.

● About digital bits

To operate the Sega Saturn main menu screen, the digital bits (Right, Left, Up, Down) change depending on the AX and AY thresholds as shown below.

<Fig. 1. Digital values and thresholds>

• Right is "0" (ON) when AX is 170 or more, and "1" (OFF) when AX is 149 or less.
• Left becomes "0" (ON) when AX is 86 or less, and "1" (OFF) when AX is 107 or more.
• Doun becomes "0" (ON) when AY is 170 or more, and "1" (OFF) when AY is 149 or less.
• Up becomes "0" (ON) when AY is 86 or less, and "1" (OFF) when AY is 107 or more.

● 6-axis mode peripheral ID

Saturn Peripheral Type: 1H (Analog Device)

Data size: 9H (9 bytes)

● 6-axis mode data format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Peripheral ID	0	0	0	1	1	0	0	1
1st data	Right	Left	Down	Up	Start	ATRG	CTRG	BTRG
2nd data	RTRG	XTRG	YTRG	ZTRG	LTRG	1	1	1
3rd data	AX7	AX6	AX5	AX4	AX3	AX2	AX1	AX0
4th data	AY7	AY6	AY5	AY4	AY3	AY2	AY1	AY0
5th data	AZ7	AZ6	AZ5	AZ4	AZ3	AZ2	AZ1	AZ0
6nd data	*	*	*	*	1	1	1	1
7rd data	BX7	BX6	BX5	BX4	BX3	BX2	BX1	BX0
8th data	BY7	BY6	BY5	BY4	BY3	BY2	BY1	BY0
9th data	BZ7	BZ6	BZ5	BZ4	BZ3	BZ2	BZ1	BZ0

• 6-axis mode can be used by connecting an option stick to 3-axis mode.

• 7th-9th Data is the analog data of the option stick.

• Since the data marked with * is undefined, the use of digital bits on the option stick is prohibited.
  Note: Digital bits are for the main stick only, see threshold for 3-axis mode.

• Start, ATRG, CTRG, BTRG, RTRG, XTRG, YTRG, ZTRG, LTRG will be 0 when the button is pressed.

• The main stick triggers A, B, and C are output to ATRG, BTRG, and CTRG, respectively.

• The triggers A, B, and C of the option stick are output to XTRG, YTRG, and ZTRG, respectively.

• AX7 to AX0, AY7 to AY0, AZ7 to AZ0, BX7 to BX0, BY7 to BY0, BZ7 to BZ0 are the absolute values of the unsigned A / D converter output.

• For AX7 to AX0, AY7 to AY0, BX7 to BX0, BY7 to BY0, the upper left is (0,0) and the lower right is (255,255).

• For AZ7 to AZ0 and BZ7 to BZ0, the bottom is 0 and the top is 255.