EZ-USB Datasheet, PDF (64/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

Table 4-1. IO Pin Functions for PORTxCFG=0 and PORTxCFG=1
PORTxCFG
bit = 0
Signal
Signal
PA0
T0OUT
PA1
T1OUT
PA2
OE#
PA3
CS#
PA4
FWR#
PA5
FRD#
PA6
RxD0OUT
PA7
RxD1OUT
PB0
T2
PB1
T2EX
PB2
RxD1
PB3
TxD1
PB4
INT4
PB5
INT5
PB6
INT6
PB7
T2OUT
PC0
RxD0
PC1
TxD0
PC2
INT0#
PC3
INT1#
PC4
T0
PC5
T1
PC6
WR#
PC7
RD#
PORTxCFG bit = 1
Direction
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
OUT
IN
IN
IN
OUT
IN
OUT
IN
IN
IN
IN
OUT
OUT
Description
Timer 0 Overflow Pulse
Timer 1 Overflow Pulse
EZ-USB Output Enable
EZ-USB Chip Select
EZ-USB Fast Write Strobe
EZ-USB Fast Read Strobe
UART0 Mode 0 Data Out
UART1 Mode 0 Data Out
Timer 2 Clock Input
Timer 2 Capture/Reload
UART1 Receive Data
UART1 Transmit Data
Interrupt 4
Interrupt 5
Interrupt 6
Timer 2 Overflow Pulse
UART0 Receive Data
UART0 Transmit Data
Interrupt 0
Interrupt 1
Timer 0 Clock Input
Timer 1 Clock Input
Write Strobe
Read Strobe
Figure
4-2
4-2
4-2
4-2
4-2
4-2
4-2
4-2
4-3
4-3
4-3
4-2
4-3
4-3
4-3
4-2
4-3
4-2
4-3
4-3
4-3
4-3
4-2
4-2
Depending on whether the alternate function is an input or output, the IO logic is slightly
different, as shown in Figure 4-2 (output) and Figure 4-3 (input). The last column of
Table 4-1 indicates which figure applies to each pin.
EZ-USB TRM v1.9
Chapter 4. EZ-USB CPU
Page 4-3