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7643 Datasheet(PDF) 358 Page - Renesas Technology Corp |
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7643 Datasheet(HTML) 358 Page - Renesas Technology Corp |
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358 / 424 page  7643 Group REJ09B0133-0200 APPENDIX 3.3 Notes on use Rev.2.00 Aug 28, 2006 page 35 of 98 (3) Pull-up control When using port P2, which includes a pull-up resistor, as an output port, its port pull-up control is invalidated, that is, pull-up cannot be enabled. q Reason Pull-up/pull-down control is valid only when each direction register is set to the input mode. 3.3.12 Notes on programming (1) Processor status register ➀ Initializing of processor status register Flags which affect program execution must be initialized after a reset. In particular, it is essential to initialize the T and D flags because they have an important effect on calculations. q Reason After a reset, the contents of the processor status register (PS) are undefined except for the I flag which is “1”. Fig. 3.3.5 Initialization of processor status register Reset ↓ Initializing of flags ↓ Main program |
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