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COPCJ823 Datasheet(PDF) 23 Page - National Semiconductor (TI) |
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COPCJ823 Datasheet(HTML) 23 Page - National Semiconductor (TI) |
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23 / 35 page  Control Registers CNTRL1 REGISTER (ADDRESS 00EE) TC3 TC2 TC1 TRUN MSEL IEDG SL1 SL0 Bit 7 Bit 0 The Timer and MICROWIRE control register contains the fol- lowing bits: TC3 Timer T1 Mode Control Bit TC2 Timer T1 Mode Control Bit TC1 Timer T1 Mode Control Bit TRUN Used to start and stop the timer/counter (1 = run, 0 = stop) MSEL Selects G5 and G4 as MICROWIRE signals SK and SO respectively IEDG External interrupt edge polarity select SL1 and SL0 Select the MICROWIRE clock divide-by (00=2, 01=4, 1x=8) PSW REGISTER (ADDRESS 00EF) HC C TPND ENTI IPND BUSY ENI GIE Bit 7 Bit 0 The PSW register contains the following select bits: HC Half-Carry Flip/Flop C Carry Flip/Flop TPND Timer T1 interrupt pending (timer Underflow or capture edge) ENTI Timer T1 interrupt enable IPND External interrupt pending BUSY MICROWIRE busy shifting flag ENI External interrupt enable GIE Global interrupt enable (enables interrupts) The Half-Carry bit is also effected by all the instructions that effect the Carry flag. The flag values depend upon the in- struction. For example, after executing the ADC instruction the values of the Carry and the Half-Carry flag depend upon the operands involved. However, instructions like SET C and RESET C will set and clear both the carry flags. Table 10 lists the instructions that effect the HC and the C flags. TABLE 10. Instructions Effecting HC and C Flags Instr. HC Flag C Flag ADC Depends on Operands Depends on Operands SUBC Depends on Operands Depends on Operands SET C Set Set RESET C Set Set RRC Depends on Operands Depends on Operands CNTRL2 REGISTER (ADDRESS 00CC) MC3 MC2 MC1 CMPEN CMPRD CMPOE WDUDF unused R/W R/W R/W R/W R/O R/W R/O Bit 7 Bit 0 MC3 Modulator/Timer Control Bit MC2 Modulator/Timer Control Bit MC1 Modulator/Timer Control Bit CMPEN Comparator Enable Bit CMPRD Comparator Read Bit CMPOE Comparator Output Enable Bit WDUDF WATCHDOG Timer Underflow Bit (Read Only) WDREG REGISTER (ADDRESS 00CD) UNUSED WDREN Bit 7 Bit 0 WDREN WATCHDOG Reset Enable Bit (Write Once Only) www.national.com 23 |
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