Table of Contents
Advertisement
III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
CFEX0: P12, P14 function extension (D0) / Port function extension register (0x402DF)
CFEX1: P10, P11, P13 function extension (D1) / Port function extension register (0x402DF)
CFEX2: P21 function extension (D2) / Port function extension register (0x402DF)
CFEX3: P31 function extension (D3) / Port function extension register (0x402DF)
CFEX4: P04 function extension (D4) / Port function extension register (0x402DF)
CFEX5: P05 function extension (D5) / Port function extension register (0x402DF)
Sets whether the function of an I/O-port pin is to be extended.
Write "1": Function-extended pin
Write "0": I/O-port/peripheral-circuit pin
Read: Valid
Writing "1" to a CFEXx bit configures the corresponding pin(s) for extended I/O operation. Otherwise, the
corresponding CFPx pin takes effect. Always write "0" to CFEX4 and CFEX5.
At cold start, CFEX0 and CFEX1 are set to "1" (function-extended pin) and other bits are set to "0" (I/O-
port/peripheral-circuit pin). At hot start, CFEX retains its state from prior to the initial reset.
B-III-9-10
EPSON
S1C33210 FUNCTION PART
Advertisement
Table of Contents
