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SPMC68CK338CPV14 Datasheet(PDF) 40 Page - Freescale Semiconductor, Inc |
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SPMC68CK338CPV14 Datasheet(HTML) 40 Page - Freescale Semiconductor, Inc |
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40 / 133 page  MOTOROLA MC68CK338 40 MC68CK338TS/D The write to the port F data register is stored in the internal data latch, and if any port F pin is configured as an output, the value stored for that bit is driven onto the pin. A read of the port F data register returns the value at the pin only if the pin is configured as a discrete input. Otherwise, the value read is the value stored in the register. The port F data register is a single register that can be accessed in two locations. When accessed at $YFFA19, the register is referred to as PORTF0; when accessed at $YFFA1B, the register is referred to as PORTF1. The register can be read or written at any time. It is unaffected by reset. The bits in this register control the direction of the pin drivers when the pins are configured as I/O. Any bit in this register set to one configures the corresponding pin as an output. Any bit in this register cleared to zero configures the corresponding pin as an input. This register can be read or written at any time. The bits in this register control the function of each port F pin. Any bit cleared to zero defines the corre- sponding pin to be an I/O pin. Any bit set to one defines the corresponding pin to be an interrupt request signal or MODCLK. The MODCLK signal has no function after reset. Table 30 shows port F pin assignments. Table 29 Port E Pin Assignments PEPAR Bit Port E Signal Bus Control Signal PEPA7 PE7 SIZ1 PEPA6 PE6 SIZ0 PEPA5 PE5 AS PEPA4 PE4 DS PEPA3 PE3 RMC PEPA2 PE2 AVEC PEPA1 PE1 DSACK1 PEPA0 PE0 DSACK0 PORTF0, PORTF1 — Port F Data Register $YFFA19, YFFA1B 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NOT USED PF7 PF6 PF5 PF4 PF3 PF2 PF1 PF0 RESET: U U U U U U U U DDRF — Port F Data Direction Register $YFFA1D 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NOT USED DDF7 DDF6 DDF5 DDF4 DDF3 DDF2 DDF1 DDF0 RESET: 0 0 0 0 0 0 0 0 PFPAR — Port F Pin Assignment Register $YFFA1F 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NOT USED PFPA7 PFPA6 PFPA5 PFPA4 PFPA3 PFPA2 PFPA1 PFPA0 RESET: DATA9 DATA9 DATA9 DATA9 DATA9 DATA9 DATA9 DATA9 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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