diff --git a/demo/adc/adc_interrupt_10bit.c b/demo/adc/adc_interrupt_10bit.c
index 51f30f1..215c8c0 100644
--- a/demo/adc/adc_interrupt_10bit.c
+++ b/demo/adc/adc_interrupt_10bit.c
@@ -50,7 +50,7 @@ void main(void)
     // Channel: ADC1
     ADC_SetChannel(0x01);
     // ADC Clock = SYSCLK / 2 / (1+15) = SYSCLK / 32
-    ADC_SetSpeed(0x0F);
+    ADC_SetClockPrescaler(0x0F);
     // Right alignment, high 2-bit in ADC_RES, low 8-bit in ADC_RESL
     ADC_SetResultAlignmentRight();
     // Enable interrupts
diff --git a/demo/adc/adc_interrupt_2ch.c b/demo/adc/adc_interrupt_2ch.c
index d930b1a..8b9e92e 100644
--- a/demo/adc/adc_interrupt_2ch.c
+++ b/demo/adc/adc_interrupt_2ch.c
@@ -68,7 +68,7 @@ void main(void)
     // Channel: ADC1
     ADC_SetChannel(0x01);
     // ADC Clock = SYSCLK / 2 / (1+15) = SYSCLK / 32
-    ADC_SetSpeed(0x0F);
+    ADC_SetClockPrescaler(0x0F);
     // Right alignment, high 2-bit in ADC_RES, low 8-bit in ADC_RESL
     ADC_SetResultAlignmentRight();
     // Enable interrupts
diff --git a/demo/adc/adc_poll_10bit.c b/demo/adc/adc_poll_10bit.c
index 644cf62..fbdb1ac 100644
--- a/demo/adc/adc_poll_10bit.c
+++ b/demo/adc/adc_poll_10bit.c
@@ -40,7 +40,7 @@ void main(void)
     // Channel: ADC1
     ADC_SetChannel(0x01);
     // ADC Clock = SYSCLK / 2 / (1+1) = SYSCLK / 4
-    ADC_SetSpeed(0x01);
+    ADC_SetClockPrescaler(0x01);
     // Right alignment, high 2-bit/4-bit in ADC_RES, low 8-bit in ADC_RESL
     ADC_SetResultAlignmentRight();
     // Turn on ADC power
diff --git a/demo/adc/adc_poll_8bit.c b/demo/adc/adc_poll_8bit.c
index ea004e9..e3e9ca4 100644
--- a/demo/adc/adc_poll_8bit.c
+++ b/demo/adc/adc_poll_8bit.c
@@ -40,7 +40,7 @@ void main(void)
     // Channel: ADC1
     ADC_SetChannel(0x01);
     // ADC Clock = SYSCLK / 2 / (1+1) = SYSCLK / 4
-    ADC_SetSpeed(0x01);
+    ADC_SetClockPrescaler(0x01);
     // Left alignment, high 8-bit in ADC_RES
     ADC_SetResultAlignmentLeft();
     // Turn on ADC power
diff --git a/include/fw_adc.h b/include/fw_adc.h
index 752dca4..d98b0c8 100644
--- a/include/fw_adc.h
+++ b/include/fw_adc.h
@@ -59,14 +59,20 @@
 #define ADC_SetResultAlignmentRight()       SFR_SET(ADCCFG, 5)
 
 /**
- * ADC conversion speed calculation:
- *   10-bit ADC Frequency ＝ SYSCLK / 2 / (SPEED + 1) / [(Switch + 1) + (Hold + 1) + (Sample + 1) + 10]
- *   12-bit ADC Frequency ＝ SYSCLK / 2 / (SPEED + 1) / [(Switch + 1) + (Hold + 1) + (Sample + 1) + 12]
+ * Time of one complete ADC conversion:
+ *   10-bit ADC: (Switch + 1) + (Hold + 1) + (Sample + 1) + 10
+ *   12-bit ADC: (Switch + 1) + (Hold + 1) + (Sample + 1) + 12
+ * 
+ * ADC conversion frequency:
+ *   10-bit ADC Frequency ＝ SYSCLK / 2 / (__PRESCALER__ + 1) / [(Switch + 1) + (Hold + 1) + (Sample + 1) + 10]
+ *   12-bit ADC Frequency ＝ SYSCLK / 2 / (__PRESCALER__ + 1) / [(Switch + 1) + (Hold + 1) + (Sample + 1) + 12]
+ * 
 */
+
 /**
- * ADC clock = SYSclk/2/(SPEED+1)
+ * ADC clock = SYSclk/2/(__PRESCALER__+1)
 */
-#define ADC_SetSpeed(__SPEED__)         (ADCCFG = ADCCFG & ~0x0F | ((__SPEED__) << 0))
+#define ADC_SetClockPrescaler(__PRESCALER__)    (ADCCFG = ADCCFG & ~0x0F | ((__PRESCALER__) << 0))
 
 /**
  * Channel switch time,