M30620FCAFP datasheet(417/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-100

UART

In conforming to the SIM interface, the UART clock signal within the SIM card needs to conform to the

UART2 clock signal within the microprocessor. Two examples are given here as means of generating a

UART2 clock signal within the microprocessor.

* In the case of setting a value equal to or less than (1/256 X 1/16) in the division rate of UART2 clock

Choose f1 for the UART’s source clock signal and set an optional value in the bit rate generator.

* In the case of setting a value equal to or greater than (1/256 X 1/16) in the division rate of UART2 clock

Set the bit rate generator to "0", turn the source clock signal to timer output and set an optional value

in the timer. In order to maintain the synchronization, the serial I/O mode select bits must be reset to

“0002”, then the UART2 transmit/receive mode register is set back to the original setting at every

one byte transmission.

Let F be the clock signal within the SIM card and D be the bit rate adjustment factor, then the formula for

the UART clock signal becomes as follows. Figure 2.5.20 shows an example of connection.

• In the case of setting a value equal to or less than (1/256 X 1/16) in the division rate of UART2 clock

UART2 clock signal within microprocessor = UART clock within SIM card

f1 xx

= f1

x flip-flop x

Let XIN = 16 MHz, timer Ai counter = 1, F = 372, and D = 1, then the value to be set in the bit rate

generator becomes

16 x

=16 x

Bit rate generator = 92

Table 2.5.8 shows an example of setting in the UART2 bit rate generator.

• In the case of setting a value equal to or greater than (1/256 X 1/16) in the division rate of UART2 clock

UART2 clock signal within microprocessor = UART clock within SIM card

f1 xx

= f1 x

Let XIN= 16 MHz, timer Ai counter = 3, bit rate generator = 0, F = 1860, and D = 1, then the value to be

set in the timer Aj counter becomes

16 x

=16 x

Timer Aj counter = 464

Table 2.5.9 shows an example of setting in the timer Aj counter.

2.5.6 Clock Signals in used for the SIM Interface

Bit rate generator + 1

Timer Ai counter + 1

F/D

372/1

flip-flop

Timer Aj counter + 1

Bit rate generator + 1

flip-flop

F/D

Bit rate generator + 1

0 + 1

1860/1

Bit rate generator + 1

Timer Aj counter + 1

3 + 1

M30620FCAFP Datasheet(PDF) 417 Page - Renesas Technology Corp

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