diff --git a/Makefile b/Makefile
index 2a2b28f..9656d51 100644
--- a/Makefile
+++ b/Makefile
@@ -9,14 +9,14 @@ STCGALOPTS ?=
 STCGALPORT ?= /dev/ttyUSB0
 STCGALPROT ?= auto
 FLASHFILE ?= main.ihx
-SYSCLK ?= 11056
-FOSC ?=11056000L
+#SYSCLK ?= 11056
+#FOSC ?=11056000L
 CFLAGS ?= -DWITH_ALT_LED9 -DWITHOUT_LEDTABLE_RELOC -DSHOW_TEMP_DATE_WEEKDAY
 
 LIBSRC = uart_init.c uart_send_chr.c uart_send_str.c \
 	 rotary_encoder_stat.c \
 	 sevenseg_dec.c sevenseg_dec_inv.c \
-	 int_to_bcd.c
+	 int_to_bcd.c getbutton.c
 
 LIBOBJ =$(patsubst %.c,%.rel, $(LIBSRC))
 LIBNAME=mc8051fun.lib
diff --git a/mc8051fun.h b/mc8051fun.h
index a47823a..71e274b 100644
--- a/mc8051fun.h
+++ b/mc8051fun.h
@@ -18,9 +18,33 @@ int8_t rotary_encoder_stat(uint8_t b);
 extern uint8_t sevenseg_dec[10];
 extern uint8_t sevenseg_dec_inv[10];
 
+/**
+ * Minimum frequency is 15 Hz @ FOSC of 11 Mhz
+ */
+#define default_timer16_init_val(freq) ((65536L)-FOSC/12L/freq)
+#define default_timer8_init_val(freq) ((256L)-FOSC/12L/freq)
+
+#define at89xx_6t_timer16_init_val(freq) ((65536L)-FOSC/6L/freq)
+#define at89xx_6t_timer8_init_val(freq) ((256L)-FOSC/6L/freq)
+
+
+#define STC15XX		1	// STC15xx family
+#define AT89XX		2	// AT89XX family
+#define AT89XX_6T	3	// AT89C89C52 in 6T mode 
+	
+#if MCU==AT89XX_6T 
+#define timer8_init_val(freq) at89xx_6t_timer8_init_val(freq) 
+#define timer16_init_val(freq) at89xx_6t_timer16_init_val(freq) 
+#else
+#define timer8_init_val(freq) default_timer8_init_val(freq) 
+#define timer16_init_val(freq) default_timer16_init_val(freq) 
+#endif
 
-#define timer_init_val(freq) ((65536)-FOSC/12L/freq)
 
 uint16_t int_to_bcd(uint16_t i);
+int getbutton(uint8_t pinval, uint8_t *button);
+extern uint8_t getbutton_time;
+
+
 
 #endif