C8051F320/1
128 Rev. 1.4
14.1. Priority Crossbar Decoder
The Priority Crossbar Decoder (Figure 14.3) assigns a priority to each I/O function, starting at the top with
UART0. When a digital resource is selected, the least-
significant unassigned Port pin is assigned to that
resource (excluding UART0, which is always at pins 4 and 5). If a Port pin is assigned, the Crossbar skips
that pin when assigning the next selected resource. Additionally, the Crossbar will skip Port pins whose
associated bits in the PnSKIP registers are set. The PnSKIP registers allow software to skip Port pins that
are to be used for analog input, dedicated functions, or GPIO.
Important Note on Crossbar Configuration: I
f a Port pin is claimed by a peripheral without use of the
Crossbar, its corresponding PnSKIP bit should be set. This applies to P0.7 if VREF is used, P0.3 and/or
P0.2 if the external oscillator circuit is enabled, P0.6 if the ADC is configured to use the external conversion
start signal (CNVSTR), and any selected ADC or Comparator inputs. The Crossbar skips selected pins as
if they were already assigned, and moves to the next unassigned pin. Figure 14.3 shows the Crossbar
Decoder priority with no Port pins skipped (P
0SKIP, P1SKIP, P2SKIP = 0x00); Figure 14.4 shows the
Crossbar Decoder priority with the XTAL1 (P0.2
) and XTAL2 (P0.3) pins skipped (P0SKIP = 0x0C).
Figure 14.3. Crossbar Priority Decoder with No Pins Skipped
XTAL1
XTAL2
CNVSTR
VREF
012345670123456701234567
SCK
MISO
MOSI
NSS*
*NSS is only pinned out in 4-wire SPI mode
CP0
CP0A
CP1
00000000000000000000
Special Function Signals are not assigned by the Crossbar. When these signals are enabled, the Crossbar must
be manually configured to skip their corresponding port pins.
Port pin potentially available to peripheral
SF Signals
ECI
T0
T1
P0SKIP[0:7] P2SKIP[0:3]
Signals Unavailable
SF Signals
PIN I/O
TX0
RX0
SDA
SCL
P0 P2
CEX3
CEX4
P1SKIP[0:7]
P1
CP1A
CEX2
CEX0
CEX1
SYSCLK
