CCS/MSP430FR5994: Clock system (LFXT)

Tool/software: Code Composer Studio

Hi!
MSP430FR5994IPN
I need to start timer from external generator.
The generator is connected to pin PJ.4 (LFXIN, pin 77)
Whell, i initialize ACLK - from external generator (32768Hz), SMCLK and MCLK - internal 8MHz:

mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
mov.b #CSKEY_H, &CSCTL0_H
mov.w #DCORSEL + DCOFSEL_4, &CSCTL1
mov.w #SELA__LFXTCLK + SELS__DCOCLK + SELM__DCOCLK, &CSCTL2 ; ACLK = LF; MCLK = DCO
mov.w #DIVA__8+DIVS__8+DIVM__8,&CSCTL3
;delay_cycles(60);
mov.w #60, r15
$1
sub.w #1, r15
tst r15
jnz $1

;Set all dividers
;Lock CS registers
mov.w # DCOFSEL_6, &CSCTL1 ; Set DCO to 8MHz
mov.w #DIVA__1+DIVS__8+DIVM__8, &CSCTL3 ; set all dividers
mov.w #LFXTDRIVE_0 + LFXTBYPASS_0, &CSCTL4
mov.b #0, &CSCTL0_H
bic.b #LOCKLPM5,&PM5CTL0

Then, initialize PJ.2 as ACLK output:

mov.b #0x0f, &PJREN
mov.b #BIT4+BIT5, &PJOUT
mov.b #11101111b, &PJDIR
mov.b #00100000b, &PJSEL1
mov.b #00110100b, &PJSEL0

Connect oscilloscope to PJ.2 (pin 23) and run....

As a result, I get a shivering frequency of approximately 37kHz.
When setting the timer, I see that the frequency selected for ACLK is not my generator, but the frequency 37k
Can you tell me where the mistake is? Why is the clock system not configured correctly?
(PS: the generator 32768Hz works correctly)
Thanks!