Integrator®/CP User Guide 4.10.1. Alphanumeric characters register

4.10.1. Alphanumeric characters register

This register is used to write characters to the alphanumeric display. The system controller FPGA manages the transfer of character data into a shift register within the alphanumeric display. You must allow each transfer to complete before writing new characters to the display using the following sequence:

Check that the display status is IDLE (bit 0 = 0) in the LED_ALPHA register.
Write 2 characters LED_ALPHA register (as a single 32-bit write to bits [31:1]).

Note

The data from the LED_ALPHA register is transferred as a serial bit-stream into the alphanumeric display at the same time as the LED control bits in LED_LIGHTS register.

Table 4.23 describes LED_ALPHA register bits.

Table 4.23. LED_ALPHA bit assignment

Bit	Name	Function
[30:1]	CHARACTERS	Bit patterns that form characters on the alphanumeric display. See Table 4.24 for segment and bit assignments. Ensure that the display is idle before writing each new character.
[0]	STATUS	This is a read-only bit that returns the status of the alphanumeric display. For compatibility with the Integrator/AP, this always returns 0.

Bit

Name

Function

[30:1]

CHARACTERS

Bit patterns that form characters on the alphanumeric display. See Table 4.24 for segment and bit assignments.

Ensure that the display is idle before writing each new character.

[0]

STATUS

This is a read-only bit that returns the status of the alphanumeric display. For compatibility with the Integrator/AP, this always returns 0.

The digits and segments are identified in Figure 4.21.

Figure 4.21. Identifying the alphanumeric display segment s

The bit assignments for the alphanumeric display segments in the LED_ALPHA register are shown in Table 4.24.

Table 4.24. LED_ALPHA bit-to-segment mapping

Digit 1	Segment	Digit 2
29	DP	30
28	T	14
27	S	13
26	R	12
25	N	11
24	M	10
23	K	9
22	H	8
21	G	7
20	F	6
19	E	5
18	D	4
17	C	3
16	B	2
15	A	1

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Digit 1	Segment	Digit 2
29	DP	30
28	T	14
27	S	13
26	R	12
25	N	11
24	M	10
23	K	9
22	H	8
21	G	7
20	F	6
19	E	5
18	D	4
17	C	3
16	B	2
15	A	1

Digit 1	Segment	Digit 2
29	DP	30
28	T	14
27	S	13
26	R	12
25	N	11
24	M	10
23	K	9
22	H	8
21	G	7
20	F	6
19	E	5
18	D	4
17	C	3
16	B	2
15	A	1

Digit 1	Segment	Digit 2
29	DP	30
28	T	14
27	S	13
26	R	12
25	N	11
24	M	10
23	K	9
22	H	8
21	G	7
20	F	6
19	E	5
18	D	4
17	C	3
16	B	2
15	A	1