TMP93CS41 datasheet(25/248 Pages) TOSHIBA

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TMP93CS40/TMP93CS41

2004-02-10

93CS40-23

3.3.2

Prescaler Clock Controller

The 9-bit prescaler provides a clock signal to the 8-bit timer 0 and timer 1, 16-bit timer 4

and timer 5, and serial interface 0 and serial interface 1. The 5-bit prescaler provides a

clock signal to the 8-bit PWM timer 0 and 1.

The clock input to the 5-bit prescaler is a clock signal which is selected as either fFPH,

fc/16, or fs according to the value in the SYSCR0<PRCK1:0> register, and divided by 2.

The clock input to the 9-bit prescaler is a clock signal which is selected as either fFPH,

fc/16, or fs according to the value in the SYSCR0<PRCK1:0> register, and divided by 4.

The <PRCK1:0> register is initialized to 00 by resetting.

When the IDLE1 mode (Operating only the oscillator) is being used, set TRUN<PRRUN>

to 0 to reduce the power consumption before a HALT instruction is executed.

3.3.3

Internal Clock Pin Output Function

(1) PA7/SCOUT pin

The PA7/SCOUT pin outputs the internal clock signals fFPH or fSYS.

One bit in the port A control register PACR<PA7C>, and two bits in the clock output

control register CKOCR<SCOEN and SCOSEL> specify the clock and the pins. The

PA7/SCOUT pin is assigned as the input port in resetting.

Table 3.3.3 shows states of the SCOUT pin in the alternative operation modes which

it can assume on condition that the PA7/SCOUT pin is specified as SCOUT output.

Table 3.3.3 SCOUT Pin States in Alternative Operation Modes

HALT Mode

Operation Mode

Output Clock

NORMAL, SLOW

RUN, IDLE2, IDLE1

STOP

fFPH

Outputs fFPH clock.

fSYS

Outputs fSYS clock.

Fixed to 0 or 1.

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