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ST72325AR7-Auto Datasheet(PDF) 241 Page - STMicroelectronics |
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ST72325AR7-Auto Datasheet(HTML) 241 Page - STMicroelectronics |
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241 / 243 page  Obsolete Product(s) - Obsolete Product(s) ST72325xxx-Auto Known limitations Doc ID 13770 Rev 3 241/243 22.1.6 TIMD set simultaneously with OC interrupt If the 16-bit timer is disabled at the same time the output compare event occurs, the output compare flag then gets locked and cannot be cleared before the timer is enabled again. Impact on the application If the output compare interrupt is enabled, then the output compare flag cannot be cleared in the timer interrupt routine. Consequently, the interrupt service routine is called repeatedly. Workaround Disable the timer interrupt before disabling the timer. Again while enabling, first enable the timer, then the timer interrupts. ● Perform the following to disable the timer: – TACR1 or TBCR1 = 0x00h; // Disable the compare interrupt – TACSR | or TBCSR | = 0x40; // Disable the timer ● Perform the following to enable the timer again: – TACSR & or TBCSR & = ~0x40; // Enable the timer – TACR1 or TBCR1 = 0x40; // Enable the compare interrupt 22.1.7 I2C multimaster In multimaster configurations, if the ST7 I2C receives a START condition from another I2C master after the START bit is set in the I2CCR register and before the START condition is generated by the ST7 I2C, it may ignore the START condition from the other I2C master. In this case, the ST7 master will receive a NACK from the other device. On reception of the NACK, ST7 can send a restart and Slave address to re-initiate communication. 22.1.8 Pull-up always active on PE2 The I/O port internal pull-up is always active on I/O port E2. As a result, if PE2 is in output mode low level, current consumption in Halt/Active Halt mode is increased. |
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