diff --git a/PCF8574.cpp b/PCF8574.cpp
index 2e33951..4a7c1cc 100644
--- a/PCF8574.cpp
+++ b/PCF8574.cpp
@@ -679,4 +679,65 @@ bool PCF8574::digitalWrite(uint8_t pin, uint8_t value){
 	return this->isLastTransmissionSuccess();
 };
 
+#ifndef PCF8574_LOW_MEMORY
+	/**
+	 * Read value of all INPUT pin
+	 * Debounce read more fast than 10millis, non managed for interrupt mode
+	 * @return
+	 */
+	void PCF8574::setVal(uint8_t pin, uint8_t value){
+		if (value==HIGH){
+			writeByteBuffered = writeByteBuffered | bit(pin);
+			byteBuffered  = writeByteBuffered | bit(pin);
+		}else{
+			writeByteBuffered = writeByteBuffered & ~bit(pin);
+			byteBuffered  = writeByteBuffered & ~bit(pin);
+		}
 
+	}
+	bool PCF8574::digitalWriteAll(PCF8574::DigitalInput digitalInput){
+
+		setVal(0, digitalInput.p0);
+		setVal(1, digitalInput.p1);
+		setVal(2, digitalInput.p2);
+		setVal(3, digitalInput.p3);
+		setVal(4, digitalInput.p4);
+		setVal(5, digitalInput.p5);
+		setVal(6, digitalInput.p6);
+		setVal(7, digitalInput.p7);
+
+		return digitalWriteAllBytes(writeByteBuffered);
+	}
+#else
+	bool PCF8574::digitalWriteAll(byte digitalInput){
+		return digitalWriteAllBytes(digitalInput);
+	}
+#endif
+
+
+bool PCF8574::digitalWriteAllBytes(byte allpins){
+	_wire->beginTransmission(_address);     //Begin the transmission to PCF8574
+
+	// writeByteBuffered = writeByteBuffered & (~writeMode & byteBuffered);
+	writeByteBuffered = allpins;
+	byteBuffered = (writeByteBuffered & writeMode) | (resetInitial & readMode);
+
+	// byteBuffered = (writeByteBuffered & writeMode) | (byteBuffered & readMode);
+	DEBUG_PRINT(" byteBuffered ");
+	DEBUG_PRINTLN(byteBuffered, BIN);
+
+	DEBUG_PRINT("Going to write data ");
+	DEBUG_PRINTLN(writeByteBuffered, BIN);
+
+	_wire->write(byteBuffered);
+
+	byteBuffered = (writeByteBuffered & writeMode) | (initialBuffer & readMode);
+
+//	byteBuffered = (writeByteBuffered & writeMode) & (byteBuffered & readMode);
+	DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
+
+	this->transmissionStatus = _wire->endTransmission();
+
+	return this->isLastTransmissionSuccess();
+
+}
diff --git a/PCF8574.h b/PCF8574.h
index b379a3a..6c66cd9 100644
--- a/PCF8574.h
+++ b/PCF8574.h
@@ -144,8 +144,11 @@ public:
 
 
 		DigitalInput digitalReadAll(void);
+
+		bool digitalWriteAll(PCF8574::DigitalInput digitalInput);
 	#else
 		byte digitalReadAll(void);
+		bool digitalWriteAll(byte digitalInput);
 	#endif
 	bool digitalWrite(uint8_t pin, uint8_t value);
 
@@ -215,6 +218,9 @@ private:
 	byte validCCW = B11100001;
 
 	uint8_t transmissionStatus = 0;
+
+	void setVal(uint8_t pin, uint8_t value);
+	bool digitalWriteAllBytes(byte allpins);
 };
 
 #endif