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ST72F262G2B5 Datasheet(PDF) 45 Page - STMicroelectronics |
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ST72F262G2B5 Datasheet(HTML) 45 Page - STMicroelectronics |
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45 / 172 page  ST72260Gx, ST72262Gx, ST72264Gx 45/172 10 MISCELLANEOUS REGISTERS The miscellaneous registers allow control over several different features such as the external in- terrupts or the I/O alternate functions. 10.1 I/O PORT INTERRUPT SENSITIVITY The external interrupt sensitivity is controlled by the ISxx bits of the Miscellaneous register and the OPTION BYTE. This control allows you to have two fully independent external interrupt source sensitivities with configurable sources (using the EXTIT option bit) as shown in Figure 29 and Fig- ure 30. Each external interrupt source can be generated on four different events on the pin: ■ Falling edge ■ Rising edge ■ Falling and rising edge ■ Falling edge and low level To guarantee correct functionality, the sensitivity bits in the MISCR1 register must be modified only when the I[1:0] bits in the CC register are set to 1 (interrupt masked). See Section 9.8 "I/O PORT REGISTER DESCRIPTION" on page 43 and Sec- tion 10.3 "MISCELLANEOUS REGISTER DE- SCRIPTION" on page 46 for more details on the programming. 10.2 I/O PORT ALTERNATE FUNCTIONS The MISCR registers manage four I/O port miscel- laneous alternate functions: ■ Main clock signal (fCPU) output on PC2 ■ SPI pin configuration: –SS pin internal control to use the PB7 I/O port function while the SPI is active. – Master output capability on the MOSI pin (PB4) deactivated while the SPI is active. – Slave output capability on the MISO pin (PB5) deactivated while the SPI is active. These functions are described in detail in the Sec- tion 10.3 "MISCELLANEOUS REGISTER DE- SCRIPTION" on page 46. Figure 29. Ext. Interrupt Sensitivity (EXTIT=0) Figure 30. Ext. Interrupt Sensitivity (EXTIT=1) ei0 INTERRUPT SOURCE IS00 IS01 MISCR1 SENSITIVITY CONTROL PA7 PA0 PC5 PC0 PB7 PB0 IS10 IS11 MISCR1 SENSITIVITY CONTROL ei1 INTERRUPT SOURCE PA7 PA0 IS00 IS01 MISCR1 SENSITIVITY CONTROL ei0 INTERRUPT SOURCE ei1 INTERRUPT SOURCE IS10 IS11 MISCR1 SENSITIVITY CONTROL PB7 PB0 PC5 PC0 |
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