TMP88CS38 datasheet(75/226 Pages) TOSHIBA

75 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-75

2.7.2

Control

The timer/counter 3 is controlled by a timer/counter 3 control register (TC3CR) and two

8-bit timer registers (TC3DRA and TC3DRB) and port multiplex control register

(PMPXCR).

TC3DRA

(0018H)

Read/Write (Initial value: 1111 1111)

TC3DRB

(0019H)

Read only (Initial value: 1111 1111)

TC3CR

(001AH)

ACAP

TC3S

TC3K

TC3M

(Initial value: *0*0 0000)

TC3M

TC3 operating mode select

0: Timer/event counter

1: Capture

NORMAL, IDLE mode

DV1CK

= 0

DV1CK

= 1

000

fc/2

001

fc/2

010

fc/2

011

fc/2

100

fc/2

101

fc/2

110

fc/2

TC3CK

TC3 source clock select [Hz]

111

External clock (TC3 pin input)

TC3S

TC3

start control

0: Stop and clear

1: Start

ACAP

Auto-capture control

−

1: Auto-capture enable

Write

only

Note 1:

fc: High-frequency clock [Hz], *: Don’t care.

Note 2:

Set the mode and source clock when the TC3 stops (TC3S

= 0).

Note 3:

Values to be loaded to timer register 3A must satisfy the following condition

TC3DRA

> 0 (in the timer and event counter mode).

Note 4:

Auto-capture can be used only int the timer and event counter mode.

Note 5:

Before setting TC3DRA or switching the operation mode, stop the TC3 (TC3S

= 0).

Note 6:

When STOP mode is started, timer counter is stopped and TC3 start control (TC3S) is cleared to “0”

automatically. Set TC3S to “1” after STOP mode is released for restarting timer counter.

Note 7:

TC3CR, TCESCR is a write-only register and must not be used with any of the read-modify-write

instructions.

PMPXCR

(0027H)

“0”

CHS

TC4ES

TC3ES

(Initial value: 00** **00)

TC3ES

TC3 input control

0: Normal

1: Invert

Write

only

Note 8

Always write “0” to bit7 in PMPXCR.

Figure 2.7.2 Timer Registers 3 and TC3 Control Register

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