diff --git a/trunk/bootrom/build/bootrom/thread/ARM11/main.c b/trunk/bootrom/build/bootrom/thread/ARM11/main.c
index 8aad0b0..22c97b0 100644
--- a/trunk/bootrom/build/bootrom/thread/ARM11/main.c
+++ b/trunk/bootrom/build/bootrom/thread/ARM11/main.c
@@ -26,7 +26,13 @@ void BromMain( void )
     osInitThread();
     while (1)
     {
-        osSleep(1);
+        OSTick tick = osGetTick();
+        u32 mon = osGetPerfMonitor(OS_MONITOR_1);
+        osSleep(1000);
+        mon = osGetPerfMonitor(OS_MONITOR_1) - mon;
+        tick = osGetTick() - tick;
+        osTPrintf( "sleep mon  = %llu msec\n", OS_TICK_TO_MSEC(mon)); // MG20ではパフォーマンスモニタのクロックが違う
+        osTPrintf( "sleep tick = %llu msec\n", OS_TICK_TO_MSEC(tick));
     }
 }
 
diff --git a/trunk/bootrom/build/libraries/os/common/os_timer.c b/trunk/bootrom/build/libraries/os/common/os_timer.c
index a6a037e..fe26202 100644
--- a/trunk/bootrom/build/libraries/os/common/os_timer.c
+++ b/trunk/bootrom/build/libraries/os/common/os_timer.c
@@ -307,7 +307,7 @@ void osStopTimer64( void )
 #ifdef SDK_ARM11
 #include <brom/code32.h>
 /*---------------------------------------------------------------------------*
-  Name:         osGetPerformanceMonitor
+  Name:         osGetPerfMonitor
 
   Description:  Get Performance Monitor
 
@@ -315,7 +315,7 @@ void osStopTimer64( void )
 
   Returns:      count
  *---------------------------------------------------------------------------*/
-ASM u32 osGetPerformanceMonitor( OSMoniter mon )
+ASM u32 osGetPerfMonitor( OSMoniter mon )
 {
         cmp     r0, #__cpp(OS_MONITOR_1)
         beq     FSYM(1)
@@ -333,7 +333,7 @@ LSYM(3)
 }
 
 /*---------------------------------------------------------------------------*
-  Name:         osSetPerformanceMonitor
+  Name:         osSetPerfMonitor
 
   Description:  Set Performance Monitor
 
@@ -342,7 +342,7 @@ LSYM(3)
 
   Returns:      previous count
  *---------------------------------------------------------------------------*/
-ASM u32 osSetPerformanceMonitor( OSMoniter mon, u32 count )
+ASM u32 osSetPerfMonitor( OSMoniter mon, u32 count )
 {
         cmp     r0, #__cpp(OS_MONITOR_1)
         beq     FSYM(1)
diff --git a/trunk/bootrom/include/brom/os/common/tick.h b/trunk/bootrom/include/brom/os/common/tick.h
index fa1747f..0149ac3 100644
--- a/trunk/bootrom/include/brom/os/common/tick.h
+++ b/trunk/bootrom/include/brom/os/common/tick.h
@@ -53,7 +53,7 @@ extern  void i_osSetTick( u64 );
 #ifdef SDK_ARM11
 #define OS_TICK_CLOCK                  HW_CPU_CLOCK
 #define OS_TICK_PRESCALE               1
-#define OS_TICK_HI_SHIFT               24               // 2の累乗単位でチック管理するのであれば32は指定できない（ロード値0では割り込みが発生しないため）
+#define OS_TICK_HI_SHIFT               24               // 2の累乗単位でチック管理するのであれば32は指定できない（ロード値0では割り込みが発生しないため。最大31）
 #define OS_TICK_HI_LSB                 (1ULL<<OS_TICK_HI_SHIFT)
 #define OS_TICK_LO_MASK                ((u32)(OS_TICK_HI_LSB-1))
 #define OS_TICK_LO_MSB                 ((u32)(OS_TICK_HI_LSB>>1))
diff --git a/trunk/bootrom/include/brom/os/common/timer.h b/trunk/bootrom/include/brom/os/common/timer.h
index 7146db6..0678d99 100644
--- a/trunk/bootrom/include/brom/os/common/timer.h
+++ b/trunk/bootrom/include/brom/os/common/timer.h
@@ -267,7 +267,7 @@ void    osStopTimer64( void );
 
 #ifdef SDK_ARM11
 /*---------------------------------------------------------------------------*
-  Name:         osGetPerformanceMonitor
+  Name:         osGetPerfMonitor
 
   Description:  Get Performance Monitor
 
@@ -275,10 +275,10 @@ void    osStopTimer64( void );
 
   Returns:      count
  *---------------------------------------------------------------------------*/
-u32 osGetPerformanceMonitor( OSMoniter id );
+u32 osGetPerfMonitor( OSMoniter id );
 
 /*---------------------------------------------------------------------------*
-  Name:         osSetPerformanceMonitor
+  Name:         osSetPerfMonitor
 
   Description:  Set Performance Monitor
 
@@ -287,7 +287,7 @@ u32 osGetPerformanceMonitor( OSMoniter id );
 
   Returns:      previous count
  *---------------------------------------------------------------------------*/
-u32 osSetPerformanceMonitor( OSMoniter id, u32 count );
+u32 osSetPerfMonitor( OSMoniter id, u32 count );
 
 /*---------------------------------------------------------------------------*
   Name:         osIsEnableTimerReload
diff --git a/trunk/include/ctr/hw/ARM11/arm11_reg.h b/trunk/include/ctr/hw/ARM11/arm11_reg.h
index 782eb6b..caa460d 100644
--- a/trunk/include/ctr/hw/ARM11/arm11_reg.h
+++ b/trunk/include/ctr/hw/ARM11/arm11_reg.h
@@ -26,7 +26,11 @@
 extern "C" {
 #endif
 
+#ifndef SDK_MG20EMU
 #define HW_CPU_CLOCK_ARM11          (67027964 * 4)
+#else // SDK_MG20EMU
+#define HW_CPU_CLOCK_ARM11          (302 * 1024 * 1024)
+#endif // SDK_MG20EMU
 #define HW_CPU_CLOCK                HW_CPU_CLOCK_ARM11
 
 #ifndef SDK_MG20EMU