diff --git a/c8_payloads/include/brfunc_common.h b/c8_payloads/include/brfunc_common.h
index dc6e34a..4e2d41d 100644
--- a/c8_payloads/include/brfunc_common.h
+++ b/c8_payloads/include/brfunc_common.h
@@ -27,6 +27,7 @@ typedef int (*BOOTROM_FUNC)();
 #define ADDR_CLOCK_GATE                     0x100009d4c
 #define ADDR_SYSTEM_TIME                    0x10000B0E0
 #define ADDR_TIME_HAS_ELAPSED               0x10000B04F
+#define ADDR_TASK_SLEEP                     0x10000ADF0
 
 #else
 #error "Unsupported checkm8 platform"
diff --git a/c8_payloads/include/brfunc_timing.h b/c8_payloads/include/brfunc_timing.h
index b3eac15..9abea32 100644
--- a/c8_payloads/include/brfunc_timing.h
+++ b/c8_payloads/include/brfunc_timing.h
@@ -7,4 +7,10 @@
 #define SYSTEM_TIME                 ((BOOTROM_FUNC) ADDR_SYSTEM_TIME)
 #define TIME_HAS_ELAPSED            ((BOOTROM_FUNC) ADDR_TIME_HAS_ELAPSED)
 
+PAYLOAD_SECTION
+void task_sleep(unsigned int usec)
+{
+    ((BOOTROM_FUNC) ADDR_TASK_SLEEP)(usec);
+}
+
 #endif //CHECKM8_TOOL_BRFUNC_TIMING_H
diff --git a/c8_payloads/src/aes_busy.c b/c8_payloads/src/aes_busy.c
index 49b880e..b3783e6 100644
--- a/c8_payloads/src/aes_busy.c
+++ b/c8_payloads/src/aes_busy.c
@@ -1,5 +1,6 @@
 #include "util.h"
 #include "brfunc_aes.h"
+#include "brfunc_timing.h"
 
 
 TEXT_SECTION
@@ -12,10 +13,12 @@ int _start(void *src, void *dst, void *key, int rep)
         src_data[j] = ((unsigned char *) src)[j];
     }
 
+    task_sleep(100);
     for(i = 0; i < rep; i++)
     {
         if(i % 2 == 0) aes_hw_crypto_cmd(16, src_data, dst, 16, 0, key, 0);
         else aes_hw_crypto_cmd(16, dst, src_data, 16, 0, key, 0);
+        task_sleep(15);
     }
 
     return 0;