P89LV51RD2BN,112

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42 P43-P45 P46-P48 P49-P51 P52-P54 P55-P57 P58-P60 P61-P63 P64-P66 P67-P69 P70-P72 P73-P75 P76-P76

P89LV51RB2_RC2_RD2_5 © NXP B.V. 2009. All rights reserved.

Product data sheet Rev. 05 — 15 December 2009 49 of 76

NXP Semiconductors

P89LV51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

Table 37. CMOD - PCA counter mode register (address D9H) count pulse select

CPS1 CPS0 Select PCA input

0 0 0 Internal clock, f

osc

/ 6

0 1 1 Internal clock, f

osc

/ 2

1 0 2 Timer 0 overﬂow

1 1 3 External clock at ECI/P1.2 pin (maximum rate = f

osc

/ 4)

Table 38. CCON - PCA counter control register (address 0D8H) bit allocation

Bit addressable; reset value: 00H.

Bit 7 6 5 4 3 2 1 0

Symbol CF CR - CCF4 CCF3 CCF2 CCF1 CCF0

Table 39. CCON - PCA counter control register (address 0D8H) bit descriptions

Bit Symbol Description

7 CF PCA Counter Overﬂow Flag. Set by hardware when the counter rolls

over. CF ﬂags an interrupt if bit ECF in CMOD is set. CF may be set by

either hardware or software but can only be cleared by software.

6 CR PCA Counter Run Control Bit. Set by software to turn the PCA counter

on. Must be cleared by software to turn the PCA counter off.

5 - Reserved for future use. Should be set to

‘0’ by user programs.

4 CCF4 PCA Module 4 Interrupt Flag. Set by hardware when a match or

capture occurs. Must be cleared by software.

3 CCF3 PCA Module 3 Interrupt Flag. Set by hardware when a match or

capture occurs. Must be cleared by software.

2 CCF2 PCA Module 2 Interrupt Flag. Set by hardware when a match or

capture occurs. Must be cleared by software.

1 CCF1 PCA Module 1 Interrupt Flag. Set by hardware when a match or

capture occurs. Must be cleared by software.

0 CCF0 PCA Module 0 Interrupt Flag. Set by hardware when a match or

capture occurs. Must be cleared by software.

Table 40. CCAPMn - PCA modules compare/capture register (address CCAPM0: 0DAH,

CCAPM1: 0DBH, CCAPM2: 0DCH, CCAPM3: 0DDH, CCAPM4: 0DEH) bit

allocation

Not bit addressable; reset value: 00H.

Bit 7 6 5 4 3 2 1 0

Symbol - ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn

Table 41. CCAPMn - PCA modules compare/capture register (address CCAPM0:

0DAH,

CCAPM1: 0DBH, CCAPM2: 0DCH, CCAPM3: 0DDH, CCAPM4: 0DEH) bit

descriptions

Bit Symbol Description

7 - Reserved for future use. Should be set to ‘0’ by user programs.

6 ECOMn Enable Comparator. ECOMn = 1 enables the comparator function.

5 CAPPn Capture Positive, CAPPn = 1 enables positive edge capture.

4 CAPNn Capture Negative, CAPNn = 1 enables negative edge capture.

P89LV51RB2_RC2_RD2_5 © NXP B.V. 2009. All rights reserved.

Product data sheet Rev. 05 — 15 December 2009 50 of 76

NXP Semiconductors

P89LV51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

6.9.1 PCA capture mode

To use one of the PCA modules in the capture mode (Figure 22) either one or both of the

CCAPM bits CAPNn and CAPPn 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).

3 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.

2 TOGn Toggle. When TOGn = 1, a match of the PCA counter with this

module’s compare/capture register causes the CEXn pin to toggle.

1 PWMn Pulse Width Modulation mode. PWMn = 1 enables the CEXn pin to be

used as a pulse-width modulated output.

0 ECCFn Enable CCF Interrupt. Enables compare/capture ﬂag CCFn in the

CCON register to generate an interrupt.

Table 41. CCAPMn - PCA modules compare/capture register (address CCAPM0:

0DAH,

CCAPM1: 0DBH, CCAPM2: 0DCH, CCAPM3: 0DDH, CCAPM4: 0DEH) bit

descriptions

…continued

Bit Symbol Description

Table 42. PCA module modes (CCAPMn register)

ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn Module function

0 0 0 0 0 0 0 no operation

X 1 0 0 0 0 X 16-bit capture by a positive-edge trigger on

CEXn

X 0 1 0 0 0 X 16-bit capture by a negative-edge trigger on

CEXn

X 1 1 0 0 0 X 16-bit capture by any transition on CEXn

1 0 0 1 0 0 X 16-bit software timer

1 0 0 1 1 0 X 16-bit high-speed output

1 0 0 0 0 1 0 8-bit PWM

1 0 0 1 X 0 X Watchdog timer

P89LV51RB2_RC2_RD2_5 © NXP B.V. 2009. All rights reserved.

Product data sheet Rev. 05 — 15 December 2009 51 of 76

NXP Semiconductors

P89LV51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

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.

6.9.2 16-bit software timer mode

The PCA modules can be used as software timers (Figure 23) by setting both the ECOMn

and MATn 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.

Fig 22. PCA capture mode

002aaa538

CF CR - CCF4 CCF3 CCF2 CCF1 CCF0

CCON

(D8H)

PCA

interrupt

PCA timer/counter

- ECOMn

0 000

CAPPn CAPNn MATn TOGn PWMn ECCFn

CCAPMn, n = 0 to 4

(DAH to DEH)

CH CL

CCAPnH CCAPnL

capture

(to CCFn)

CEXn

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42 P43-P45 P46-P48 P49-P51 P52-P54 P55-P57 P58-P60 P61-P63 P64-P66 P67-P69 P70-P72 P73-P75 P76-P76

P89LV51RD2BN,112

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Manufacturer:

NXP Semiconductors

Description:

IC MCU 8BIT 64KB FLASH 40DIP

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