p89cv51rb2 NXP Semiconductors, p89cv51rb2 Datasheet - Page 45

• Manufacturer Part Number: p89cv51rb2
• Description: P89cv51rb2/rc2/rd2 8-bit 80c51 5 V Low Power 64 Kb Flash Microcontroller With 1 Kb Ram, Spi, 6-clock Cpu With 6/12-clock Peripherals
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 39.
P89CV51RB2_RC2_RD2_1
Product data sheet
ECOMn
0
X
X
X
1
1
1
1
CAPPn
0
1
0
1
0
0
0
0
PCA module modes (CCAPMn register)
6.9.1 PCA capture mode
CAPNn
0
0
1
1
0
0
0
0
Table 37.
Not bit addressable; reset value: 00H.
Table 38.
To use one of the PCA modules in the Capture mode
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).
Bit
7
6
5
4
3
2
1
0
Bit
Symbol
MATn
0
0
0
0
1
1
0
1
CCAPMn - PCA modules compare/capture register (address CCAPM0 DAH,
CCAPM1 DBH, CCAPM2 DCH, CCAPM3 DDH, CCAPM4 DEH) bit allocation
CCAPMn - PCA modules compare/capture register (address CCAPM0 DAH,
CCAPM1 DBH, CCAPM2 DCH, CCAPM3 DDH, CCAPM4 DEH) bit description
Symbol
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
7
-
TOGn
0
0
0
0
0
1
0
X
ECOMn
Rev. 01 — 5 October 2007
6
Description
Reserved for future use. Should be set to 0 by user programs.
Enable Comparator. ECOMn = 1 enables the comparator function.
Capture Positive, CAPPn = 1 enables positive edge capture.
Capture Negative, CAPNn = 1 enables negative edge capture.
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.
Toggle. When TOGn = 1, a match of the PCA counter with this
module’s compare/capture register causes the CEXn pin to toggle.
Pulse Width Modulation mode. PWMn = 1 enables the CEXn pin to be
used as a pulse-width modulated output.
Enable CCF interrupt. Enables compare/capture flag CCFn in the
CCON register to generate an interrupt.
PWMn
0
0
0
0
0
0
1
0
CAPPn
5
ECCFn
0
X
X
X
X
X
0
X
P89CV51RB2/RC2/RD2
CAPNn
4
no operation
16-bit capture by a positive-edge trigger on
16-bit capture by a negative-edge trigger on
16-bit capture by any transition on CEXn
16-bit software timer
16-bit high-speed output
8-bit PWM
watchdog timer
Module function
CEXn
CEXn
MATn
(Figure
3
21), either one or both of the
80C51 with 1 kB RAM, SPI
TOGn
2
© NXP B.V. 2007. All rights reserved.
PWMn
1
ECCFn
45 of 73
0