diff --git a/fw/common/regs-f320.h b/fw/common/regs-f320.h
new file mode 100644
index 0000000..76c7a7d
--- /dev/null
+++ b/fw/common/regs-f320.h
@@ -0,0 +1,42 @@
+/*
+ * common/regs-f320.h - C8051F320 register definitions
+ *
+ * Written 2008 by Werner Almesberger
+ * Copyright 2008 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef REGS_F320_H
+#define REGS_F320_H
+
+#include <mcs51/C8051F326.h>
+#include "regs-f32x.h"
+
+
+/* RSTSRC, extending f32x */
+#define	WDTRSF	0x08	/* Watchdog Timer Reset Flag */
+#define	C0RSEF	0x20	/* Comparator0 Reset Enable and Flag */
+
+/* XBR0 */
+#define	URT0E	0x01	/* UART I/O Output Enable */
+#define	SPI0E	0x02	/* SPI I/O Enable */
+#define	SMB0E	0x04	/* SMBus I/O Enable */
+#define	SYSCKE	0x08	/* nSYSCLK Output Enable */
+#define	CP0E	0x10	/* Comparator0 Output Enable */
+#define	CP0AE	0x20	/* Comparator0 Asynchronous Output Enable */
+#define	CP1E	0x40	/* Comparator1 Output Enable */
+#define	CP1AE	0x80	/* Comparator1 Asynchronous Output Enable */
+
+/* XBR1 */
+#define	ECIE	0x08	/* PCA0 External Counter Input Enable */
+#define	T0E	0x10	/* T0 Enable */
+#define	T1E	0x20	/* T1 Enable */
+#define	XBARE	0x40	/* Crossbar Enable */
+#define	WEAKPUD	0x80	/* Port I/O Weak Pull-up Disable */
+
+#endif /* REGS_F320_H */
diff --git a/fw/common/regs-f326.h b/fw/common/regs-f326.h
new file mode 100644
index 0000000..a20b619
--- /dev/null
+++ b/fw/common/regs-f326.h
@@ -0,0 +1,36 @@
+/*
+ * common/regs.h - C8051F326 register definitions
+ *
+ * Written 2008 by Werner Almesberger
+ * Copyright 2008 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef REGS_F326_H
+#define REGS_F326_H
+
+#include <mcs51/C8051F326.h>
+#include "regs-f32x.h"
+
+
+/* GPIOCN */
+#define	SYSCLK	0x01	/* nSYSCLK Enable */
+#define	INPUTEN	0x40	/* Global Digital Input Enable */
+#define	WEAKPUD	0x80	/* Port I/O Weak Pullup Disable */
+
+/* SMOD0 */
+#define	S0DL0	0x04	/* Data Length */
+#define	S0DL1	0x08	/* 00: 5-bit, 01: 6-bit, 10: 7-bit, 11: 8-bit */
+
+/* SBCON0 */
+#define	SB0PS0	0x01	/* Baud Rate Prescaler Select */
+#define	SB0PS1	0x02	/* 00: /12, 01: /4, 10: /48, 11: /1 */
+#define	SB0RUN	0x40	/* Baud Rate Generator Enable */
+#define	SB0CLK	0x80	/* Baud Rate Clock Source */
+
+#endif /* REGS_F326_H */
diff --git a/fw/common/regs.h b/fw/common/regs-f32x.h
similarity index 86%
rename from fw/common/regs.h
rename to fw/common/regs-f32x.h
index cf3fb39..07809e6 100644
--- a/fw/common/regs.h
+++ b/fw/common/regs-f32x.h
@@ -1,5 +1,5 @@
 /*
- * common/regs.h - C8051F326 register definitions
+ * common/regs-f32x.h - C8051F32x register definitions
  *
  * Written 2008 by Werner Almesberger
  * Copyright 2008 Werner Almesberger
@@ -11,10 +11,9 @@
  */
 
 
-#ifndef REGS_H
-#define REGS_H
+#ifndef REGS_F32X_H
+#define REGS_F32X_H
 
-#include <mcs51/C8051F326.h>
 #include "usb-regs.h"
 
 
@@ -35,6 +34,9 @@
 /* OSCICN */
 #define	IFCN0	0x01	/* Internal Oscillator Frequency Control */
 #define	IFCN1	0x02	/* 00: /8, 01: /4, 10: /2, 11: /1 */
+#define SUSPEND	0x20	/* Force Suspend */
+#define IFRDY	0x40	/* Internal Oscillator Frequency Ready Flag */
+#define IOSCEN	0x80	/* Internal Oscillator Enable Bit */
 
 /* CLKMUL */
 #define	MULSEL	0x01	/* Clock Multiplier Input Select */
@@ -42,11 +44,6 @@
 #define	MULINIT	0x40	/* Clock Multiplier Initialize */
 #define	MULEN	0x80	/* Clock Multiplier Enable */
 
-/* GPIOCN */
-#define	SYSCLK	0x01	/* nSYSCLK Enable */
-#define	INPUTEN	0x40	/* Global Digital Input Enable */
-#define	WEAKPUD	0x80	/* Port I/O Weak Pullup Disable */
-
 /* VDM0CN */
 #define VDMEN	0x80	/* VDD Monitor Enable */
 #define	VDDSTAT	0x40	/* VDD Status */
@@ -62,6 +59,7 @@
 #define	PREN	0x80	/* Internal Pullup Resistor Enable */
 
 /* USB0ADR */
+#define	AUTORD	0x40	/* USB0 Register Auto-read Flag */
 #define	BUSY	0x80	/* USB0 Register Read Busy Flag */
 
 /* SMOD0 */
@@ -74,4 +72,4 @@
 #define	SB0RUN	0x40	/* Baud Rate Generator Enable */
 #define	SB0CLK	0x80	/* Baud Rate Clock Source */
 
-#endif /* REGS_H */
+#endif /* REGS_F32X_H */