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MC9S08SH8 Datasheet(PDF) 25 Page - Freescale Semiconductor, Inc |
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MC9S08SH8 Datasheet(HTML) 25 Page - Freescale Semiconductor, Inc |
25 / 338 page Chapter 2 Pins and Connections MC9S08SH8 MCU Series Data Sheet, Rev. 3 Freescale Semiconductor 25 Figure 2-5. Basic System Connections 2.2.1 Power VDD and VSS are the primary power supply pins for the MCU. This voltage source supplies power to all I/O buffer circuitry, ACMP and ADC modules, and to an internal voltage regulator. The internal voltage regulator provides regulated lower-voltage source to the CPU and other internal circuitry of the MCU. Typically, application systems have two separate capacitors across the power pins. In this case, there should be a bulk electrolytic capacitor, such as a 10- μF tantalum capacitor, to provide bulk charge storage for the overall system and a 0.1- μF ceramic bypass capacitor located as near to the MCU power pins as practical to suppress high-frequency noise. Each pin must have a bypass capacitor for best noise suppression. BKGD/MS RESET OPTIONAL MANUAL RESET VDD BACKGROUND HEADER SYSTEM POWER PORT B PTB0/PIB0/RxD/ADP4 PTB1/PIB1/TxD/ADP5 PTB2/PIB2/SPSCK/ADP6 PTB3/PIB3/MOSI/ADP7 PTB4/TPM2CH1/MISO PTB5/TPM1CH1/SS PTB6/SDA/XTAL PTB7/SCL/EXTAL PORT C PTC0/TPM1CH0/ADP8 PTC1/TPM1CH1/ADP9 PTC2/ADP10 PTC3/ADP11 MC9S08SH8 VSS VDD CBY 0.1 μF CBLK 10 μF + 5 V + C2 C1 X1 RF RS PORT A PTA0/PIA0/TPM1CH0/ADP0/ACMP+ PTA1/PIA1/TPM2CH0/ADP1/ACMP- PTA2/PIA2/SDA/ADP2 PTA3/PIA3/SCL/ADP3 0.1 μF VDD 4.7 k Ω–10 kΩ NOTE 1 NOTES: 1. External crystal circuit not required if using the internal clock option. 2. RESET pin can only be used to reset into user mode, you can not enter BDM using RESET pin. BDM can be entered by holding MS low during POR or writing a 1 to BDFR in SBDFR with MS low after issuing BDM command. 3. RC filter on RESET pin recommended for noisy environments. PTA4/ACMPO/BKGD/MS PTA5/IRQ/TCLK/RESET |
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