MC9S08AW32CPUE Datasheet, PDF (30/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 2 Pins and Connections
When IRQ is configured as the IRQ input and is set to detect rising edges, a pulldown device rather than
a pullup device is enabled.
In EMC-sensitive applications, an external RC filter is recommended on the IRQ pin. See Figure 2-4 for
an example.
2.3.7 General-Purpose I/O and Peripheral Ports
The remaining pins are shared among general-purpose I/O and on-chip peripheral functions such as timers
and serial I/O systems. Immediately after reset, all of these pins are configured as high-impedance
general-purpose inputs with internal pullup devices disabled.
NOTE
To avoid extra current drain from floating input pins, the reset initialization
routine in the application program should either enable on-chip pullup
devices or change the direction of unused pins to outputs so the pins do not
float.
For information about controlling these pins as general-purpose I/O pins, see Chapter 6, “Parallel
Input/Output.” For information about how and when on-chip peripheral systems use these pins, refer to the
appropriate chapter from Table 2-1.
Table 2-1. Pin Sharing Priority
Lowest <- Pin Function Priority -> Highest
Port Pins
PTB7–PTB0
PTC5, PTC3
PTC2
PTC1–PTC0
PTD7
Alternate Function
AD1P7–AD1P0
RxD2–TxD2
MCLK
SCL1–SDA1
KBI1P7
Alternate Function
AD1P15
PTD6
TPM1CLK
AD1P14
PTD5
PTD4
AD1P13
TPM2CLK
AD1P13
AD1P12
PTD3–PTD2 KBI1P6–KBI1P5
AD1P11–AD1P10
PTD1–PTD0
PTE7
PTE6
PTE5
PTE4
PTE3–PTE2
PTE1–PTE0
PTF5–PTF4
AD1P9–AD1P8
SPSCK1
MOSI1
MISO1
SS1
TPM1CH1–
TPM1CH0
RxD1–TxD1
TPM2CH1–
TPM2CH0
Reference¹
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 11, “Serial Communications Interface (S08SCIV2)”
Chapter 5, “Resets, Interrupts, and System Configuration”
Chapter 13, “Inter-Integrated Circuit (S08IICV1)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 9, “Keyboard Interrupt (S08KBIV1)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 10, “Timer/PWM (S08TPMV2)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 10, “Timer/PWM (S08TPMV2)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 9, “Keyboard Interrupt (S08KBIV1)”
Chapter 14, “Analog-to-Digital Converter (S08ADC10V1)”
Chapter 12, “Serial Peripheral Interface (S08SPIV3)”
Chapter 10, “Timer/PWM (S08TPMV2)”
Chapter 11, “Serial Communications Interface (S08SCIV2)”
Chapter 10, “Timer/PWM (S08TPMV2)”
MC9S08AW60 Data Sheet, Rev 2
30
Freescale Semiconductor