Rainbow-electronics T89C51RD2 Manual do Utilizador Página 29
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29 Rev. F - 15 February, 2001
T89C51RD2
Figure 10. PCA Compare Mode and PCA Watchdog Timer
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, otherwise an unwanted
match could happen. Writing to CCAPnH will set the ECOM bit.
Once ECOM set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t occur while modifying
the compare value. Writing to CCAPnH will set ECOM. For this reason, user software should write CCAPnL first,
and then CCAPnH. Of course, the ECOM bit can still be controlled by accessing to CCAPMn register.
6.5.3. High Speed Output Mode
In this mode the CEX output (on port 1) associated with the PCA module will toggle each time a match occurs
between the PCA counter and the module's capture registers. To activate this mode the TOG, MAT, and ECOM
bits in the module's CCAPMn SFR must be set (See Figure 11).
A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.
CH CL
CCAPnH CCAPnL
ECOMn
CCAPMn, n = 0 to 4
0xDA to 0xDE
CAPNn MATn TOGn PWMn ECCFnCAPPn
16 bit comparator
Match
CCON
0xD8
PCA IT
Enable
PCA counter/timer
RESET *
CIDL CPS1 CPS0 ECF
CMOD
0xD9
WDTE
* Only for Module 4
Reset
Write to
CCAPnL
Write to
CCAPnH
CF CCF2 CCF1 CCF0
CR
CCF3
CCF4
10
- T89C51RD2 1
- VQFP64 1.4 6
- 6.1.1. Description 10
- Application 13
- 6.4.1. Auto-Reload Mode 17
- 6.5.1. PCA Capture Mode 27
- 6.5.3. High Speed Output Mode 29
- Write to 30
- 6.5.5. PCA Watchdog Timer 31
- 6.6.3. Given Address 33
- 6.6.4. Broadcast Address 34
- 6.6.5. Reset Addresses 34
- 6.10.1. Using the WDT 43
- 8.4.1. FLASH register 51
- 8.4.2. Hardware register 51
- 8.4.3. Software registers 53
- Boot loader FLASH 55
- Reset Code Execution 56
- Boot process summary 57
- 8.9.1. Signature bytes 64
- 8.9.2. Set-up modes 64
- 8.9.3. Definition of terms 66
- 8.9.4. Programming Algorithm 67
- 8.9.5. Verify algorithm 68
- 8.9.6. Extra memory mapping 68
- Symbol Parameter Min 71
- Max Unit Test Conditions 71
- 9.5. AC Parameters 75
- Rev. F - 15 February, 2001 76 76
- Table 38. Symbol Description 76
- 77 Rev. F - 15 February, 2001 77
- Rev. F - 15 February, 2001 78 78
- Table 41. Symbol Description 78
- 79 Rev. F - 15 February, 2001 79
- Rev. F - 15 February, 2001 80 80
- 81 Rev. F - 15 February, 2001 81
- Table 44. Symbol Description 81
- Rev. F - 15 February, 2001 82 82
- 9.5.14. Float Waveforms 84
- 9.5.15. Clock Waveforms 85
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