T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 105

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

16.3. PCA Capture Mode
To use one of the PCA modules in capture mode either one or both of the CCAPM bits CAPN and CAPP for
that module must be set. The external CEX input for the module (on port 1) is sampled for a transition. When a
valid transition occurs the PCA hardware loads the value of the PCA counter registers (CH and CL) into the
module’s capture registers (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON SFR and the
ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated.
Rev.A - May 17, 2001
CEXn
n = 0, 1
7
-
0CAPPnCAPNn000 ECCFn
Figure 106. PCA Capture Mode
CCAPMn Register (n = 0, 1)
Preliminary
CCON Reg
CCFn
CCAPnH CCAPnL
T89C51CC02
(8bits)
PCA Counter
CH
0
(8bits)
CL
PCA
Interrupt
Request
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