PCA9685 turning all outputs on / off

I'm working on a project that uses the PCA9685 chip. The chip is set up using the following code, which I confess was provided for me by a friend, but I get the gist of things in that it resets the chip and sets a pre-scaler or something !

Code:

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'Initialize the PCA9685

i2cControl      var BYTE                'Used for PCA chip control
i2cReadAddress  var BYTE
i2cWriteAddress var BYTE
pcaAddress      var BYTE
oldMode        var BYTE
newMode        var BYTE
pcaChannel      var BYTE

i2cReadAddress = pcaAddress << 1
i2cWriteAddress = i2cReadAddress | 1
i2cControl = $0                                                    ;Reset
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[$0]              ;PCA9685_MODE1 $0
i2cControl = $0                                                    'PCA9685_MODE1 $0
I2CREAD SDApin,SCLpin,i2cReadAddress,i2cControl,[oldMode]          ;Get old mode
newMode = (oldMode & $7F) | $10                                    ;MODE1 Sleep
i2cControl = $0
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[newMode]        ;PCA9685_MODE1 $0
i2cControl = $FE                                                    ;PCA9685_PRESCALE $FE
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[6]              ;Prescaler is now 6 was 11
i2cControl = $0                                                    ;PCA9685_MODE1 $0
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[oldMode]        ;Set old mode
i2cControl = $0                                                    ;PCA9685_MODE1 $0
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[oldMode | $A1 ]  ;Set MODE1 AutoIncrementOn | $A1

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Using word variables (CH1_PWM, CH2_PWN etc) for the 0 to 4095 PWM levels the following code performs the setting of channel brightness, (the value for pcaChannel runs through from 0 to 15 for the 16 channels with each increment of CHx_PWM variable if that makes sense ?)

Code:

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pcaChannel = 0                                           
i2cControl = $6 + 4*pcaChannel                           
I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[0,0,CH1_PWM.lowbyte,CH1_PWM.highbyte]

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The above code is called when a time condition is matched, so each channel is has its own on/off time in a 24 hour period. But I want to have a manual over-ride so that if a button is pressed it jumps to a gosub routine which makes all the outputs of the PCA chip turn on. Looking at the datasheet https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf there is register setting to turn all the LEDs on or off (FA, FB, FC and FD) but I don't know how to implement this in the code, so wondered if anyone has some suggestions ?

Well I got a work around

Code:

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override:
LCDOUT $FE,$D4,"All On "

A=4095
For B = 0 to 15
pcaChannel = B                                         
    i2cControl = $6  + 4*pcaChannel                                                     
 I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[0,0,A.lowbyte,A.highbyte]
next B


If IncButton=0 then
A=0
For B = 0 to 15
pcaChannel = B
i2cControl = $6  + 4*pcaChannel
    I2CWRITE SDApin,SCLpin,i2cWriteAddress,i2cControl,[0,0,A.lowbyte,A.highbyte]
next B
        Gosub SetButtonRelease
        n=0
LCDOUT $FE,$D4,"      "
endif

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table 4 p 13 ...

registers 250 to 255 ...

What else ??? (Nespresso ? )

Alain