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ST72321BXXX-AUTO Datasheet(PDF) 31 Page - STMicroelectronics |
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ST72321BXXX-AUTO Datasheet(HTML) 31 Page - STMicroelectronics |
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31 / 247 page  ST72321Bxxx-Auto Package pinout and pin description 31/247 Legend / Abbreviations for Table 2: Type: I = input O = output S = supply Input level: A = dedicated analog input In/Output level: C = CMOS 0.3VDD/0.7VDD CT = CMOS 0.3VDD/0.7VDD with input trigger Output level: HS = 20mA high sink (on N-buffer only) Port and control configuration: ● Input: float = floating wpu = weak pull-up int = interrupt(a) ana = analog ● Output: OD = open-drain(b) PP = push-pull 62 1 PE1/RDI I/O CT X X X X Port E1 SCI Receive Data In 63 -(1) PE2 I/O CT X X(6) X(6) Port E2 64 - (2)(1) PE3 I/O CT X XX X Port E3 1. On the chip, each I/O port may have up to 8 pads. Pads that are not bonded to external pins are in input pull-up configuration after reset. The configuration of these pads must be kept at reset state to avoid added current consumption. 2. On the chip, each I/O port may have up to eight pads. Pads that are not bonded to external pins are in input pull-up configuration after reset. The configuration of these pads must be kept at reset state to avoid added current consumption. 3. It is mandatory to connect all available VDD and VAREF pins to the supply voltage and all VSS and VSSA pins to ground. 4. Not connected in 48 Kbyte and 64 Kbyte ROM devices 5. OSC1 and OSC2 pins connect a crystal/ceramic resonator or an external source to the on-chip oscillator; see Chapter 1: Introduction on page 18 and Section 19.5: Clock and timing characteristics on page 199 for more details. 6. Pull-up always activated on PE2; see limitation Section 22.1.8: Pull-up always active on PE2 on page 244. Table 2. Device pin description (continued) Pin No. Pin name Level Port Main function (after reset) Alternate function Input Output a. In the interrupt input column, “eiX” defines the associated external interrupt vector. If the weak pull-up column (wpu) is merged with the interrupt column (int), then the I/O configuration is pull-up interrupt input, otherwise the configuration is floating interrupt input. b. In the open-drain output column, “T” defines a true open-drain I/O (P-Buffer and protection diode to VDD are not implemented). See Chapter 9: I/O ports on page 75 and Section 19.8: I/O port pin characteristics on page 207 for more details. |
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