1. 7/23 Coldfire 5211 Signals and IO Multiplexing Computer Science & Engineering Department Arizona State University Tempe, AZ 85287 Dr. Yann-Hang Lee yhlee@asu.edu (480) 727-7507

2. set 5 -- 1 Coldfire 5211 Processor  64-pin LQFP (Low Profile Quad Flat Pack packages )  81-ball MAPBGA (Multi-array Plastic Ball Grid Array)  16Kb SRAM  128Kb flash

3. set 5 -- 2 5211 64-pin Package  There are many I/O functions to connect to external signals and the number of pins in a chip is limited  Multiplex multiple I/O functions to one pin  primary function,  alternate functions,  general-purpose I/O  Pin function is set by the operating mode  Pin layout shows primary functions

4. set 5 -- 3 Coldfire GPIO  I/O pins are grouped into 8-bit ports. Some ports do not use all 8 bits. Each port has registers that configure, monitor, and control the port pins.

5. set 5 -- 4 Coldfire Port Registers  Port Output Data Registers (PORTn)  store the data to be driven on the corresponding port n pins when the pins are configured for digital output.  Port Data Direction Registers (DDRn)  control the direction of the port n pin drivers pad control pin assignment

6. set 5 -- 5 Coldfire Port Registers  Port Pin Data/Set Data Registers (PORTnP/SETn)  reflect the current pin states and control the setting of output pins  Port Clear Output Data Registers (CLRn)  Writing 0s to a CLRn register clears the corresponding bits in the PORTn register.  Pin Assignment Registers (PnPAR_)  allow each pin controlled by each register bit to be configured between the multiplexed functions  Pad Control Registers  pin slew rate register  pin drive strength register (10mA or 2mA)

7. set 5 -- 6 Example: UART Pin Initialization  To configure the pins for UART0 and UART1 to their primary functions #define MCF_GPIO_PUAPAR (*(vuint8 *)(&__IPSBAR[0x100059])) #define MCF_GPIO_PUBPAR (*(vuint8 *)(&__IPSBAR[0x10005A])) #define MCF_GPIO_PUAPAR_RXD0_RXD0 (0x04) #define MCF_GPIO_PUAPAR_TXD0_TXD0 (0x01) void mcf5211_uart_init(void) { /* Enable the proper UART pins */ MCF_GPIO_PUBPAR = 0 | MCF_GPIO_PUBPAR_RXD1_RXD1 | MCF_GPIO_PUBPAR_TXD1_TXD1; MCF_GPIO_PUAPAR = 0 | MCF_GPIO_PUAPAR_RXD0_RXD0 | MCF_GPIO_PUAPAR_TXD0_TXD0; /* Enable the default UART terminal port */ uart_init(sys_clk_khz, BAUD, 0); }

8. set 5 -- 7 Example: LED on DTIN pins /* Display the lower 4 bits of 'number' on the 4 LEDs connected to DTIN[3:0] * * LED: LED4 LED3 LED2 LED1 * PIN: TIN3 TIN2 TIN1 TIN0 * BIT: 3 2 1 0*/ void leds_init() { MCF_GPIO_PTCPAR = 0/* Enable signals as GPIO */ | MCF_GPIO_PTCPAR_TIN3_GPIO | MCF_GPIO_PTCPAR_TIN2_GPIO | MCF_GPIO_PTCPAR_TIN1_GPIO | MCF_GPIO_PTCPAR_TIN0_GPIO; MCF_GPIO_DDRTC = 0/* Enable signals as digital outputs */ | MCF_GPIO_DDRTC_DDRTC3 | MCF_GPIO_DDRTC_DDRTC2 | MCF_GPIO_DDRTC_DDRTC1 | MCF_GPIO_DDRTC_DDRTC0; } void leds_dsiplay (unit8 number) { MCF_GPIO_PORTTC = number; /* Set output values */ }