Philips Semiconductors Product data
P89C660/P89C662/P89C664/
P89C668
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
2002 Oct 28
56
CCAPMn Address CCAPM0 0C2H
CCAPM1 0C3H
CCAPM2 0C4H
CCAPM3 0C5H
CCAPM4 0C6H
Reset Value = X000 0000B
– ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn
Not Bit Addressable
Bit:
Symbol Function
– Not implemented, reserved for future use*.
ECOMn Enable Comparator. ECOMn = 1 enables the comparator function.
CAPPn Capture Positive, CAPPn = 1 enables positive edge capture.
CAPNn Capture Negative, CAPNn = 1 enables negative edge capture.
MATn Match. When MATn = 1, a match of the PCA counter with this module’s compare/capture register causes the CCFn bit
in CCON to be set, flagging an interrupt.
TOGn Toggle. When TOGn = 1, a match of the PCA counter with this module’s compare/capture register causes the CEXn
pin to toggle.
PWMn Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse width modulated output.
ECCFn Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to generate an interrupt.
NOTE:
*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new
bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU01100
76543210
Figure 45. CCAPMn: PCA Modules Compare/Capture Registers
–
ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn MODULE FUNCTION
X 0 0 0 0 0 0 0 No operation
X X 1 0 0 0 0 X 16-bit capture by a positive-edge trigger on CEXn
X X 0 1 0 0 0 X 16-bit capture by a negative trigger on CEXn
X X 1 1 0 0 0 X 16-bit capture by a transition on CEXn
X 1 0 0 1 0 0 X 16-bit Software Timer
X 1 0 0 1 1 0 X 16-bit High Speed Output
X 1 0 0 0 0 1 0 8-bit PWM
X 1 0 0 1 X 0 X Watchdog Timer
Figure 46. PCA Module Modes (CCAPMn Register)
PCA Capture Mode
To use one of the PCA modules in the 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 (refer to Figure 47).
16-bit Software Timer Mode
The PCA modules can be used as software timers by setting both
the ECOM and MAT bits in the modules CCAPMn register. The PCA
timer will be compared to the module’s capture registers, and when
a match occurs, an interrupt will occur if the CCFn (CCON SFR) and
the ECCFn (CCAPMn SFR) bits for the module are both set (see
Figure 48).
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 49).
Pulse Width Modulator Mode
All of the PCA modules can be used as PWM outputs. Figure 50
shows the PWM function. The frequency of the output depends on
the source for the PCA timer. All of the modules will have the same
frequency of output because they all share the PCA timer. The duty
cycle of each module is independently variable by using the
module’s capture register CCAPLn. When the value of the PCA CL
SFR is less than the value in the module’s CCAPLn SFR, the output
will be low. When it is equal to or greater than, the output will be
high. When CL overflows from FF to 00, CCAPLn is reloaded with
the value in CCAPHn. This allows PWM update without glitches.
The PWM and ECOM bits in the module’s CCAPMn register must
be set to enable the PWM mode.
