Datasheet

ADSP-BF534/ADSP-BF536/ADSP-BF537
Rev. I | Page 23 of 68 | July 2010
Clock
CLKIN I Clock/Crystal Input
XTAL O Crystal Output (If CLKBUF is enabled, does not three-state during hibernate.)
CLKBUF O Buffered XTAL Output (If enabled, does not three-state during hibernate.) E
Mode Controls
RESET
IReset
NMI
I Nonmaskable Interrupt (This pin should be pulled high when not used.)
BMODE2–0 I Boot Mode Strap 2-0 (These pins must be pulled to the state required for the
desired boot mode.)
Voltage Regulator
VROUT1–0 O External FET Drive (These pins should be left unconnected when not used and
are driven high during hibernate.)
Supplies
V
DDEXT
P I/O Power Supply
V
DDINT
P Internal Power Supply
V
DDRTC
P Real-Time Clock Power Supply (This pin should be connected to V
DDEXT
when
not used and should remain powered at all times.)
GND G External Ground
1
See Output Drive Currents on Page 51 for more information about each driver types.
Table 9. Pin Descriptions (Continued)
Pin Name Type Function
Driver
Type
1