Interfaces and Connectors
EBX-11 Reference manual
57
;Set PWMs to manual mode (required)
; PWM 1 Configuration Register = 5Ch
; PWM 2 Configuration Register = 5Dh
; PWM 3 Configuration Register = 5Eh
;
MOV DX, C70h
MOV AL, 5Ch ;PWM 1 Configuration Register
OUT DX, AL
MOV DX, C71h
IN AL, DX ;Read Current Value
OR AL, E0h ;Set Manual Mode
OUT DX, AL
;Set Zone X Low Temp Limits to valid values (Required)
;All three must be set even if only one PWM is used...
MOV DX, C70h
MOV AL, 67h ;Zone 1 Low Temp Limit Register
OUT DX, AL
MOV DX, C71h
MOV AL, 81h ;any value other than default of 80h
OUT DX, AL
MOV DX, C70h
MOV AL, 68h ;Zone 2 Low Temp Limit Register
OUT DX, AL
MOV DX, C71h
MOV AL, 81h ;Any value other than default of 80h
OUT DX, AL
MOV DX, C70h
MOV AL, 69h ;Zone 3 Low Temp Limit Register
OUT DX, AL
MOV DX, C71h
MOV AL, 81h ;Any value other than default of 80h
OUT DX, AL
;Set PWM current duty cycle (optional)
; PWM 1 Current Duty Cycle Register = 30h
; PWM 2 Current Duty Cycle Register = 31h
; PWM 3 Current Duty Cycle Register = 32h
;
MOV DX, C70h
MOV AL, 30h ;PWM 1 Current Duty Cycle Register
OUT DX, AL
MOV DX, C71h
MOV AL, 80h ;50% Duty Cycle, 40h = 25%, etc.
OUT DX, AL
;Set PWM Frequency (optional)
; Zone 1 Range/PWM 1 Frequency Register = 5Fh
; Zone 2 Range/PWM 2 Frequency Register = 60h
; Zone 3 Range/PWM 3 Frequency Register = 61h
;
; Frequency = low nibble
; X0 = 11.0 Hz X6 = 58.6Hz
; X1 = 14.6Hz X7 = 87.7Hz
; X2 = 21.9Hz X8 = 15 KHz
; X3 = 29.3Hz X9 = 20 KHz
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