diff --git a/klippy/extras/multi_pin.py b/klippy/extras/multi_pin.py
index f5177bd9..c834ee07 100644
--- a/klippy/extras/multi_pin.py
+++ b/klippy/extras/multi_pin.py
@@ -46,9 +46,9 @@ class PrinterMultiPin:
     def set_digital(self, print_time, value):
         for mcu_pin in self.mcu_pins:
             mcu_pin.set_digital(print_time, value)
-    def set_pwm(self, print_time, value, cycle_time=None):
+    def set_pwm(self, print_time, value):
         for mcu_pin in self.mcu_pins:
-            mcu_pin.set_pwm(print_time, value, cycle_time)
+            mcu_pin.set_pwm(print_time, value)
 
 def load_config_prefix(config):
     return PrinterMultiPin(config)
diff --git a/klippy/extras/replicape.py b/klippy/extras/replicape.py
index d6737a35..ab501caf 100644
--- a/klippy/extras/replicape.py
+++ b/klippy/extras/replicape.py
@@ -67,7 +67,7 @@ class pca9685_pwm:
         cmd_queue = self._mcu.alloc_command_queue()
         self._set_cmd = self._mcu.lookup_command(
             "queue_pca9685_out oid=%c clock=%u value=%hu", cq=cmd_queue)
-    def set_pwm(self, print_time, value, cycle_time=None):
+    def set_pwm(self, print_time, value):
         clock = self._mcu.print_time_to_clock(print_time)
         if self._invert:
             value = 1. - value
diff --git a/klippy/extras/sx1509.py b/klippy/extras/sx1509.py
index 51080fe2..3bfecb78 100644
--- a/klippy/extras/sx1509.py
+++ b/klippy/extras/sx1509.py
@@ -183,7 +183,7 @@ class SX1509_pwm(object):
             shutdown_value = 1. - shutdown_value
         self._start_value = max(0., min(1., start_value))
         self._shutdown_value = max(0., min(1., shutdown_value))
-    def set_pwm(self, print_time, value, cycle_time=None):
+    def set_pwm(self, print_time, value):
         self._sx1509.set_register(self._i_on_reg, ~int(255 * value)
                                   if not self._invert
                                   else int(255 * value) & 0xFF)
diff --git a/klippy/mcu.py b/klippy/mcu.py
index 7f784de7..f9b547c9 100644
--- a/klippy/mcu.py
+++ b/klippy/mcu.py
@@ -381,9 +381,9 @@ class MCU_pwm:
         self._pin = pin_params['pin']
         self._invert = pin_params['invert']
         self._start_value = self._shutdown_value = float(self._invert)
-        self._last_clock = self._last_cycle_ticks = 0
+        self._last_clock = 0
         self._pwm_max = 0.
-        self._set_cmd = self._set_cycle_ticks = None
+        self._set_cmd = None
     def get_mcu(self):
         return self._mcu
     def setup_max_duration(self, max_duration):
@@ -441,40 +441,21 @@ class MCU_pwm:
         self._mcu.add_config_cmd(
             "set_digital_out_pwm_cycle oid=%d cycle_ticks=%d"
             % (self._oid, cycle_ticks))
-        self._last_cycle_ticks = cycle_ticks
+        self._pwm_max = float(cycle_ticks)
         svalue = int(self._start_value * cycle_ticks + 0.5)
         self._mcu.add_config_cmd(
             "queue_digital_out oid=%d clock=%d on_ticks=%d"
             % (self._oid, self._last_clock, svalue), is_init=True)
         self._set_cmd = self._mcu.lookup_command(
             "queue_digital_out oid=%c clock=%u on_ticks=%u", cq=cmd_queue)
-        self._set_cycle_ticks = self._mcu.lookup_command(
-            "set_digital_out_pwm_cycle oid=%c cycle_ticks=%u", cq=cmd_queue)
-    def set_pwm(self, print_time, value, cycle_time=None):
-        clock = self._mcu.print_time_to_clock(print_time)
-        minclock = self._last_clock
-        self._last_clock = clock
+    def set_pwm(self, print_time, value):
         if self._invert:
             value = 1. - value
-        if self._hardware_pwm:
-            v = int(max(0., min(1., value)) * self._pwm_max + 0.5)
-            self._set_cmd.send([self._oid, clock, v],
-                               minclock=minclock, reqclock=clock)
-            return
-        # Soft pwm update
-        if cycle_time is None:
-            cycle_time = self._cycle_time
-        cycle_ticks = self._mcu.seconds_to_clock(cycle_time)
-        if cycle_ticks != self._last_cycle_ticks:
-            if cycle_ticks >= 1<<31:
-                raise self._mcu.get_printer().command_error(
-                    "PWM cycle time too large")
-            self._set_cycle_ticks.send([self._oid, cycle_ticks],
-                                       minclock=minclock, reqclock=clock)
-            self._last_cycle_ticks = cycle_ticks
-        on_ticks = int(max(0., min(1., value)) * float(cycle_ticks) + 0.5)
-        self._set_cmd.send([self._oid, clock, on_ticks],
-                           minclock=minclock, reqclock=clock)
+        v = int(max(0., min(1., value)) * self._pwm_max + 0.5)
+        clock = self._mcu.print_time_to_clock(print_time)
+        self._set_cmd.send([self._oid, clock, v],
+                           minclock=self._last_clock, reqclock=clock)
+        self._last_clock = clock
 
 class MCU_adc:
     def __init__(self, mcu, pin_params):