TMP88CU74F datasheet(97/132 Pages) TOSHIBA

97 / 132 page

TMP88CU74

2003-02-17

88CU74-97

(1) Serial clock

Clock source

The SCK(bits 2 to 0 in SBICR1) is used to select the following functions.

Internal clock

In an internal clock mode, any of seven frequencies can be selected. The serial

clock is output to the outside on the SCK0 pin. The SCK0 pin becomes a high

level when data transfer starts. When writing (in the transmit mode) or reading

(in the receive mode) data cannot follow the serial clock rate, an automatic-wait

function is executed to stop the serial clock automatically and hold the next shift

operation until reading or writing is complete.

Figure 2.10.18 Automatic Wait Function

External clock (SCK = “111”)

An external clock supplied to the SCK0 pin is used as the serial clock. In order

to ensure shift operation, a pulse width of at least 4 machine cycles is required for

both high and low levels in the serial clock. The maximum data transfer frequency

is 390 kHz (fc = 12.5 MHz).

Figure 2.10.19 The Maximum Data Transfer Frequency in the External Clock Input

Shift edge

The leading edge is used to transmit data, and the trailing edge is used to

receive data.

Leading edge

Data is shifted on the leading edge of the serial clock (at a falling edge of the

SCK0

pin input/output).

Trailing edge

Data is shifted on the trailing edge of the serial clock (at a rising edge of the

SCK0

pin input/output).

automatic-wait function

SCK

pin output

SO0 pin output

Write transmitted

data

b1 b4

SCK

tSCKL tSCKH

tSCKL, tSCKH

> 4 tcyc

Note: tcyc = 4/fc (in NORMAL mode, IDLE mode)

2007-10-19

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