NCO Glitch

[mpgmike]

I'm sending NCO values from one PIC to another. The Comm protocol requires 2 bytes per NCO1INCx register; 1st identifies it, 2nd is the NCO1INCx value. Finally there is a "Start" command byte sent. I noticed shooting for 2.4 MHz that I only got 564 Hz. However, if I turn the NCO Module Off, then On again, I get the 2.4 MHz. Here is the code for the Receiver:

DEFINE  OSC         8
DEFINE  HSER_RCSTA  90h             ;Enable serial port & continuous receive
DEFINE  HSER_TXSTA  02h             ;Disable transmit, BRGH = 0
DEFINE  HSER_CLROERR 1              ;Clear overflow automatically
DEFINE  HSER_BAUD   9600


;Configurations:
#CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_OFF & _PWRTE_OFF & _WDTE_ON & _LPBOREN_OFF & _BOREN_ON & _BORV_LOW & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WRT_OFF & _LVP_OFF
    __config _CONFIG4, _CP_OFF & _CPD_OFF
#ENDCONFIG


;Aliases:
;Prb        VAR     LATA.0		       ;HF Generator Driver for Probes
;RX         VAR     PORTA.1		       ;USART Receive
;TX         VAR     PORTA.2		       ;USART Transmit
;MCLR       VAR     PORTA.3		       ;!MCLR
;NC         VAR     PORTA.4		       ;
;Wand       VAR     LATA.5 		       ;HF Generator Driver for IR LEDs


;Special Function Registers:
OSCCON1     =   %00000010                   ;INTTOSC, 1:4 Divider, 8 MHz
OSCFRQ      =   %00000011                   ;8 MHz
TRISA       =   %00001110
ANSELA      =   0
WPUA        =   0
    PPSLOCK = $55
    PPSLOCK = $AA
    PPSLOCK = 0                             ;Unlock PPS
;RA0PPS      =   %00011101                   ;Sets NCO Output to RA0, Pin 7
;RA5PPS      =   %00011101                   ;Sets NCO Output to RA5, Pin 2
RA2PPS  	=   %00010100                   ;Sets USART TX to RA2, Pin 5
RXPPS       =   %00000001                   ;Sets USART RX to RA1, Pin 6
    PPSLOCK = $55
    PPSLOCK = $AA
    PPSLOCK = 1                             ;Lock PPS
NCO1CON     =   %10000000
NCO1CLK     =   1                           ;NCO1 Clock = Fosc
PMD0        =   %01000101
PMD1        =   %00000101
PMD2        =   %01100110
PMD3        =   %01110011
PMD4        =   %00000000
PMD5        =   %00000111
VREGCON     =   3                           ;Lowest Power in SLEEP Mode
CPUDOZE     =   %10100100
INTCON      =   %01000000
TX1STA      =   %00000010                   ;$02
RC1STA      =   %10010000                   ;$90
BAUD1CON    =   %00000010
SP1BRGL     =   $0C                         ;Decimal 12, Yields 9600 BAUD
PIE1.5      =   1                           ;RCIE, USART Receive Flag


;Variables:
NcoL        VAR     BYTE BANK0 SYSTEM       ;USART NCO1INCL Value
NcoH        VAR     BYTE BANK0 SYSTEM       ;USART NCO1INCH Value
NcoU        VAR     BYTE BANK0 SYSTEM       ;USART NCO1INCU Value
Rec         VAR     BYTE BANK0 SYSTEM       ;USART Receive Register Value


;Constants:
Begin       CON     %10010000               ;USART Command to Start NCO, $90
Halt        CON     %10010001               ;USART Command to Stop NCO, $91
IR          CON     $92                     ;USART Command to Set NCO Output to LATA.5
Prb         CON     $93                     ;USART Command to Set NCO Output to LATA.0
NcoL_Val    CON     %10000001               ;USART Command, Following is NcoL, $81
NcoH_Val    CON     %10000010               ;USART Command, Following is NcoH, $82
NcoU_Val    CON     %10000011               ;USART Command, Following is NcoU, $83


;Labels:
Main:
    PIR1.5 = 0
    PAUSE 50
DO
    DO
        LOOP WHILE PIR1.5 = 0
    GOSUB Orders
LOOP


Run:
DO 
    IF PIR1.5 = 1 THEN
        GOSUB Orders
    ENDIF
    PAUSE 1
LOOP        


Slumber:
    NCO1CON.7 = 0
@   DOZE
@   NOP
GOTO Main
    
Orders:
    HSERIN [Rec]
;   Rec = RC1REG
    SELECT CASE Rec
        CASE IS = $81
            HSERIN [NcoL]
            NCO1INCL = NcoL
        CASE IS = $82
            HSERIN [NcoH]
            NCO1INCH = NcoH
        CASE IS = $83
            HSERIN [NcoU]
            NCO1INCU = NcoU
        CASE IS = $90
            STKPTR = STKPTR - 1
            PIR1.5 = 0
            NCO1CON.7 = 1.  ;Turn NCO On
            PAUSE 500
            NCO1CON.7 = 0. ;Turn NCO Off
            PAUSE 500
            NCO1CON.7 = 1. ;Turn NCO On
            GOTO Run
        CASE IS = $91
            STKPTR = STKPTR - 1
            PIR1.5 = 0
            GOTO Slumber
        CASE IS = $92
            PPSLOCK = $55
            PPSLOCK = $AA
            PPSLOCK = 0                             ;Unlock PPS
            RA5PPS  = %00011101                     ;Sets NCO Output to RA5, Pin 2
            PPSLOCK = $55
            PPSLOCK = $AA
            PPSLOCK = 1                             ;Lock PPS
            TRISA.0 = 1                             ;Shuts Down Alt Pin LATA.0
        CASE IS = $93
            PPSLOCK = $55
            PPSLOCK = $AA
            PPSLOCK = 0                             ;Unlock PPS
            RA0PPS  = %00011101                     ;Sets NCO Output to RA0, Pin 7
            PPSLOCK = $55
            PPSLOCK = $AA
            PPSLOCK = 1                             ;Lock PPS
            TRISA.5 = 1                             ;Shuts Down Alt Pin LATA.5
    END SELECT
    PIR1.5 = 0
RETURN

There is a slight delay in getting the 2.4 MHz output, which for this application is acceptable. Just wondering if I might have overlooked something simple.