NXP Semiconductors UM11712, User Manual, Page: 12 / 31

NXP Semiconductors
UM11712
PCAL6534EV-ARD evaluation board
4.9.2 Count mode
In this mode, an internal counter clocked by the RC oscillator of MAX V counts up and
down, at low speed (clock frequency: 7.6 Hz), or high speed (clock frequency: 61 Hz).
The counting status, direction, and speed are set by the MAX_CTRL_# lines of the
control bus. See Table 5 for MAX_CTRL lines. The current value of the counter is sent
to ports P0 and P1 of the DUT IC (configured as inputs) and displayed in the GUI. The
range of the counter value is from 000 to 999.
Bus line Function State Description
0 Low speed (7.5 Hz)
MAX_CTRL_0 Speed
1 High speed (60 Hz)
0 down
MAX_CTRL_1 Direction
1 up
0 Counter is ON
MAX_CTRL_2 Status
1 Counter is OFF (the counting is stopped)
Table 5. MAX_CTRL_# control lines
4.9.3 Idle mode
In this mode, the internal counter is stopped, the LED display is OFF, except the Digit 4
(D13) which is displaying “-“ (minus) sign (see Figure 3 ).
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
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