PC87591L datasheet(143/437 Pages) NSC

143 / 437 page

Embedded Controller Modules (Continued)

Revision 1.07

143

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Timer/Counter Register 2 (TnCNT2)

The TnCNT2 register is a word-wide read/write register that is not altered by reset. The power-up value is unknown.

Location: MFT16 1: 00 FD8616

MFT16 2: 00 FDA616

Type: R/W

Clock Pre-Scaler Register (TnPRSC)

The TnPRSC register is a byte-wide read/write register. It contains the current value of the clock pre-scaler, CLKPS. The

Location: MFT16 1: 00 FD8816

MFT16 2: 00 FDA816

Type: R/W

Clock Unit Control Register (TnCKC)

The TnCKC register is a byte-wide read/write register. It defines the clock source selection for each timer counter. The reg-

ister is cleared on reset, thus disabling timer/counter 1 and timer/counter 2 clocks.

Location: MFT16 1: 00 FD8A16

MFT16 2: 00 FDAA16

Type: R/W

Bit

9876543210

Name

TCNT2

Bit

76543210

Name

Reserved

CLKPS

Reset

00000000

Bit

Description

4-0

CLKPS (Clock Pre-Scaler). The timer clock is generated by dividing the system clock by CLKPS+1. Therefore

the maximum timer clock frequency is equal to the system clock (CLKPS=00000) and the minimum timer clock

is the system clock divided by 32 (CLKPS=11111).

7-5

Reserved.

Bit

76543210

Name

Reserved

C2CSEL

C1CSEL

Reset

00000000

Bit

Description

2-0

C1CSEL (Counter 1 Clock Select). Deﬁnes the clock mode for timer/counter 1 where:

Bits

2 1 0

Description

0 0 0:

No Clock (Counter 1 stopped)

0 0 1:

Prescaled system clock

0 1 0:

External Event on TBn

0 1 1:

Pulse Accumulate

1 0 0:

Slow-speed Clock

Other:

Reserved

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