Direct Write - NXP Semiconductors UM11712 User Manual

NXP Semiconductors
Table 3. CPLD control bus
Bus line
MAX_CLK
MAX_CLR
MAX_OE
MAX_CTRL_0
MAX_CTRL_1
MAX_CTRL_2
[1] Don't care
[2] See Section 4.9.2 and Table 4
[3] See Section 4.9.1

4.9.1 Direct write

Table 4. MAX V data bus
PCAL6534 pin
P0_0
Write decimal numbers from the GUI to
P0_1
Digit 1 (D16). The PCAL6534 pins are
P0_2
configured as outputs.
P0_3
P0_4
Write decimal numbers from the GUI to
P0_5
Digit 2 (D15). The PCAL6534 pins are
P0_6
configured as outputs.
P0_7
P1_0 Write decimal numbers from the GUI to
Digit 3 (D14). The PCAL6534 pins are
P1_1
configured as outputs.
P1_2
P1_3
P1_4 Set ON/OFF the dot of Digit 1 (D16)
P1_5 Set ON/OFF the dot of Digit 2 (D15)
P1_6 Set ON/OFF the dot of Digit 3 (D14)
P1_7 Set ON/OFF the dot of Digit 4 (D13)
UM11712
User manual
Direct Write
Not used
0
0
[1]
X
Controls the indication
of digit 4 (D9)
[1]
X
When this mode is activated, the user can write decimal values from the GUI directly
to the on-board LED display on the PCAL6534EV-ARD board. For the Digit 1, 2, and
3 (D14, D15, and D16), the user can write decimal numbers from 0 to 9. For Digit 4
(D13), the user can set the letter "U" or "d" (the initials of "Up" and "down"). This setting
is realized through the MAX_CTRL_1 (not trough one I/O line of the PCAL6534 IC). The
dots of the digits can be set separately. See
Direct write
All information provided in this document is subject to legal disclaimers.
Count
Not used
Controls the speed
of counting
Controls the direction
[3]
of counting
Controls the counting status
Count
Read the current data from
Digit 1 (D16). The PCAL6534
pins are configured as inputs.
Read the current data from
Digit 2 (D15). The PCAL6534
pins are configured as inputs.
Read the current data from
Digit 3 (D14). The PCAL6534
pins are configured as inputs.
The PCAL6534 pins are
configured as inputs. The
lines are set in high state in
MAX V.
Rev. 1.0 — 31 January 2022
PCAL6534EV-ARD evaluation board
0
1
[2]
[2]
[2]
Table 4 and Figure 3 for details.
No action. The MAX V
corresponding pins are in high
Z.
UM11712
Idle
Not used
1
0
[1]
X
0
[1]
X
Idle
© NXP B.V. 2022. All rights reserved.
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