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MC9S08RD60CFGE Datasheet(PDF) 74 Page - Freescale Semiconductor, Inc |
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MC9S08RD60CFGE Datasheet(HTML) 74 Page - Freescale Semiconductor, Inc |
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74 / 234 page  Parallel Input/Output MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11 74 Freescale Semiconductor 6.3 Pin Descriptions The MC9S08RC/RD/RE/RG has a total of 39 parallel I/O pins distributed between four 8-bit ports and one 7-bit port. Not all pins are bonded out in all packages. Consult the pin assignment in Chapter 2, “Pins and Connections,” for available parallel I/O pins. All of these pins are available for general-purpose I/O when they are not used by other on-chip peripheral systems. The following paragraphs discuss each port and the software controls that determine each pin’s use. 6.3.1 Port A Figure 6-1. Port A Pin Names Port A is an 8-bit general-purpose I/O port shared with the KBI1 keyboard interrupt inputs. Bit 0 of port A is an input-only pin. Port A pins are available as general-purpose I/O pins controlled by the port A data (PTAD), data direction (PTADD), and pullup enable (PTAPE) registers. Refer to Section 6.4, “Parallel I/O Controls,” for more information about general-purpose I/O control. Any of the port A pins can be configured as a KBI1 keyboard interrupt pin. Refer to the Keyboard Interrupt (KBI) Module chapter for more information about using port A pins as keyboard interrupt pins. 6.3.2 Port B Figure 6-2. Port B Pin Names Port B is an 8-bit general-purpose I/O port with two pins shared with the SCI and one pin shared with the TPM. The port B output drivers are capable of high current drive. Port B pins are available as general-purpose I/O pins controlled by the port B data (PTBD), data direction (PTBDD), and pullup enable (PTBPE) registers. Refer to Section 6.4, “Parallel I/O Controls,” for more information about general-purpose I/O control. When the SCI module is enabled, PTB0 and PTB1 function as the transmit (TxD1) and receive (RxD1) pins of the SCI. Refer to the Serial Communications Interface (SCI) Module chapter for more information about using PTB0 and PTB1 as SCI pins. The TPM can be configured to use PTB7 as either an input capture, output compare, or PWM pin. Refer to the Timer/PWM Module (TPM) Module chapter for more information about using PTB7 as a timer pin. Port A Bit 7 654321 Bit 0 MCU Pin: PTA7/ KBI1P7 PTA6/ KBI1P6 PTA5/ KBI1P5 PTA4/ KBI1P4 PTA3/ KBI1P3 PTA2/ KBI1P2 PTA1/ KBI1P1 PTA0/ KBI1P0 Port B Bit 7 654321 Bit 0 MCU Pin: PTB7/ TPM1CH1 PTB6 PTB5 PTB4 PTB3 PTB2 PTB1/ RxD1 PTB0/ TxD1 |
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