TS80C51RD2-ECJR View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
TS80C51RD2-ECJR Datasheet PDF : 74 Pages
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TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
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.
Write to
CCAPnL Reset
Write to
CCAPnH
1
0
Enable
CF CR
CCAPnH
CCAPnL
16 bit comparator
CCON
CCF4 CCF3 CCF2 CCF1 CCF0 0xD8
PCA IT
Match
CH
CL
CEXn
PCA counter/timer
CCAPMn, n = 0 to 4
ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn 0xDA to 0xDE
Figure 11. PCA High Speed Output Mode
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, otherwise an unwanted
match could happen.
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.
32
Rev. C - 06 March, 2001
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