P89V51RD2 Philips Semiconductors, P89V51RD2 Datasheet - Page 46

• Manufacturer Part Number: P89V51RD2
• Description: 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 12964
Product data
Table 36:
Table 37:
Table 38:
Bit addressable; Reset value: 00H
Table 39:
Bit
7
6
5 to 3
2 to 1
0
CPS1
0
0
1
1
Bit
7
6
5
4
3
2
1
0
Bit
Symbol
CMOD - PCA counter mode register (address D9H) bit description
CMOD - PCA counter mode register (address D9H) count pulse select
CCON - PCA counter control register (address 0D8H) bit allocation
CCON - PCA counter control register (address 0D8H) bit description
Symbol
CIDL
WDTE
-
CPS1,
CPS0
ECF
Symbol
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CF
7
CPS0
0
1
0
1
Rev. 01 — 01 March 2004
CR
6
Description
Counter Idle Control: CIDL = 0 programs the PCA Counter to
continue functioning during Idle Mode. CIDL = 1 programs it to be
gated off during idle.
Watchdog Timer Enable: WDTE = 0 disables Watchdog timer
function on module 4. WDTE = 1 enables it.
Reserved for future use. Should be set to
PCA Count Pulse Select (see
PCA Enable Counter Overflow Interrupt: ECF = 1 enables CF bit in
CCON to generate an interrupt. ECF = 0 disables that function.
Description
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.
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.
Reserved for future use. Should be set to
PCA Module 4 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
PCA Module 3 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
PCA Module 2 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
PCA Module 1 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
PCA Module 0 Interrupt Flag. Set by hardware when a match or
capture occurs. Must be cleared by software.
5
-
Select PCA input
0 Internal clock, f
1 Internal clock, f
2 Timer 0 overflow
3 External clock at ECI/P1.2 pin (max rate = f
CCF4
4
8-bit microcontrollers with 80C51 core
osc
osc
CCF3
Table 37
3
/ 6
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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
CCF2
below).
P89V51RD2
2
‘0’
‘0’
by user programs.
by user programs.
CCF1
1
osc
/ 4)
CCF0
46 of 75
0