AT89C5130A-RDTUM datasheet(60/188 Pages) ATMEL

60 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

Reset Value = 00XX X000b

Not bit addressable

The CMOD register includes three additional bits associated with the PCA (See Figure 14-1 and

Table 14-1).

• The CIDL bit allows the PCA to stop during idle mode.

• The WDTE bit enables or disables the watchdog function on module 4.

• The ECF bit when set causes an interrupt and the PCA overflow flag CF (in the CCON SFR)

to be set when the PCA timer overflows.

The CCON register contains the run control bit for the PCA and the flags for the PCA timer (CF)

and each module (see Table 14-2).

• Bit CR (CCON.6) must be set by software to run the PCA. The PCA is shut off by clearing this

bit.

• Bit CF: The CF bit (CCON.7) is set when the PCA counter overflows and an interrupt will be

generated if the ECF bit in the CMOD register is set. The CF bit can only be cleared by

software.

• Bits 0 through 4 are the flags for the modules (bit 0 for module 0, bit 1 for module 1, etc.) and

are set by hardware when either a match or a capture occurs. These flags can only be

cleared by software.

Table 14-2.

CCON Register

CCON - PCA Counter Control Register (D8h)

–

CCF4

CCF3

CCF2

CCF1

CCF0

Bit

Number

Bit

Mnemonic

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

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

Set by software to turn the PCA counter on.

–

Reserved

The value read from this bit is indeterminate. Do not set this bit.

CCF4

PCA Module 4 interrupt flag

Must be cleared by software.

Set by hardware when a match or capture occurs.

CCF3

PCA Module 3 interrupt flag

Must be cleared by software.

Set by hardware when a match or capture occurs.

CCF2

PCA Module 2 interrupt flag

Must be cleared by software.

Set by hardware when a match or capture occurs.

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