diff --git a/firmware/export/s5l8700.h b/firmware/export/s5l8700.h
index 98021099d8..47b34808b6 100644
--- a/firmware/export/s5l8700.h
+++ b/firmware/export/s5l8700.h
@@ -25,7 +25,7 @@
 #define REG16_PTR_T volatile uint16_t *
 #define REG32_PTR_T volatile uint32_t *
 
-#define TIMER_FREQ  47923200L
+#define TIMER_FREQ  (1843200 * 4 * 26 / 1 / 4) /* 47923200 Hz */
 
 #define CACHEALIGN_BITS (4) /* 2^4 = 16 bytes */
 
diff --git a/firmware/target/arm/s5l8700/system-target.h b/firmware/target/arm/s5l8700/system-target.h
index adc0eb6bfe..170794a999 100644
--- a/firmware/target/arm/s5l8700/system-target.h
+++ b/firmware/target/arm/s5l8700/system-target.h
@@ -25,18 +25,18 @@
 #include "mmu-arm.h"
 
 #define CPUFREQ_SLEEP      32768
-#define CPUFREQ_DEFAULT 47923200
-#define CPUFREQ_NORMAL  47923200
-#define CPUFREQ_MAX    191692800
+#define CPUFREQ_MAX     (1843200 * 4 * 26 / 1) /* 191692800 Hz */
+#define CPUFREQ_DEFAULT (CPUFREQ_MAX/4)        /*  47923200 Hz */
+#define CPUFREQ_NORMAL  (CPUFREQ_MAX/4)
 
 #define STORAGE_WANTS_ALIGN
 
-#define inl(a) (*(volatile unsigned long *) (a))
+#define inl(a)    (*(volatile unsigned long *) (a))
 #define outl(a,b) (*(volatile unsigned long *) (b) = (a))
-#define inb(a) (*(volatile unsigned char *) (a))
+#define inb(a)    (*(volatile unsigned char *) (a))
 #define outb(a,b) (*(volatile unsigned char *) (b) = (a))
-#define inw(a) (*(volatile unsigned short *) (a))
-#define outw(a,b) (*(volatile unsigned short *) (b) = (a))
+#define inw(a)    (*(volatile unsigned short*) (a))
+#define outw(a,b) (*(volatile unsigned short*) (b) = (a))
 
 static inline void udelay(unsigned usecs)
 {