diff --git a/chips/samd11/system_samd11.c b/chips/samd11/system_samd11.c
index 0539b5a..f69377f 100644
--- a/chips/samd11/system_samd11.c
+++ b/chips/samd11/system_samd11.c
@@ -73,7 +73,7 @@ void sys_init(void) {
     // if no crystal, set up internal 32k oscillator
     uint32_t calib = (*((uint32_t *) FUSES_OSC32K_ADDR) & FUSES_OSC32K_Msk);
     SYSCTRL->OSC32K.reg = SYSCTRL_OSC32K_CALIB(calib) |
-                          SYSCTRL_OSC32K_STARTUP(0x6) |
+                          SYSCTRL_OSC32K_STARTUP(0x3) |
                           SYSCTRL_OSC32K_EN32K |
                           SYSCTRL_XOSC32K_RUNSTDBY;
     SYSCTRL->OSC32K.bit.ENABLE = 1;
diff --git a/chips/samd21/system_samd21.c b/chips/samd21/system_samd21.c
index 58d2a97..9bfa473 100644
--- a/chips/samd21/system_samd21.c
+++ b/chips/samd21/system_samd21.c
@@ -98,7 +98,7 @@ void sys_init(void) {
     // if no crystal, set up internal 32k oscillator
     uint32_t calib = (*((uint32_t *) FUSES_OSC32K_CAL_ADDR) & FUSES_OSC32K_CAL_Msk);
     SYSCTRL->OSC32K.reg = SYSCTRL_OSC32K_CALIB(calib) |
-                          SYSCTRL_OSC32K_STARTUP(0x6) |
+                          SYSCTRL_OSC32K_STARTUP(0x3) |
                           SYSCTRL_OSC32K_EN32K |
                           SYSCTRL_XOSC32K_RUNSTDBY;
     SYSCTRL->OSC32K.bit.ENABLE = 1;
diff --git a/chips/samd51/system_samd51.c b/chips/samd51/system_samd51.c
index 7222695..f172774 100644
--- a/chips/samd51/system_samd51.c
+++ b/chips/samd51/system_samd51.c
@@ -118,7 +118,7 @@ void sys_init(void) {
                            GCLK_GENCTRL_RUNSTDBY |
                            GCLK_GENCTRL_GENEN;
 #else
-    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x6) |
+    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x3) |
                               OSC32KCTRL_XOSC32K_XTALEN |
                               OSC32KCTRL_XOSC32K_EN1K |
                               OSC32KCTRL_XOSC32K_EN32K |
diff --git a/chips/saml21/system_saml21.c b/chips/saml21/system_saml21.c
index e9448bc..ee084c2 100644
--- a/chips/saml21/system_saml21.c
+++ b/chips/saml21/system_saml21.c
@@ -101,7 +101,7 @@ void sys_init(void) {
                            GCLK_GENCTRL_RUNSTDBY |
                            GCLK_GENCTRL_GENEN;
 #else
-    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x6) |
+    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x3) |
                               OSC32KCTRL_XOSC32K_XTALEN |
                               OSC32KCTRL_XOSC32K_EN1K |
                               OSC32KCTRL_XOSC32K_EN32K |
diff --git a/chips/saml22/system_saml22.c b/chips/saml22/system_saml22.c
index f0ea39a..83e20a0 100644
--- a/chips/saml22/system_saml22.c
+++ b/chips/saml22/system_saml22.c
@@ -84,7 +84,7 @@ void sys_init(void) {
     // use the internal OSCULP32K. This means timekeeping will be less accurate.
     OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_ULP1K;
 #else
-    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x6) |
+    OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_STARTUP(0x3) |
                               OSC32KCTRL_XOSC32K_XTALEN |
                               OSC32KCTRL_XOSC32K_EN1K |
                               OSC32KCTRL_XOSC32K_EN32K |