m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 90

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.4.7 Clock Signals in used for the SIM Interface
In conforming to the SIM interface, the UART clock signal within the SIM card needs to conform to the
UARTi (i=0 to 3) clock signal within the microprocessor. Two examples are given here as means of
generating a UARTi clock signal within the microprocessor.
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 2.4.19 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 UARTi clock
Table 2.4.8 shows an example of setting in the UARTi 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 UARTi clock
Table 2.4.9 shows an example of setting in the timer Ak counter.
f
16 x
f
= f
16 x
1
1
* In the case of setting a value equal to or less than (1/256 X 1/16) in the division rate of UARTi clock
* In the case of setting a value equal to or greater than (1/256 X 1/16) in the division rate of UARTi clock
UARTi clock signal within microprocessor = UART clock within SIM card
Let X
generator becomes
Bit rate generator = 92
UARTi clock signal within microprocessor = UART clock within SIM card
Let X
set in the timer Ak counter becomes
Timer Ak counter = 464
Choose f
Set the bit rate generator to “0”, turn the source clock signal to timer output and set an optional value
in the timer.
x
1
x
x
Timer Ak counter + 1
Bit rate generator + 1
IN
IN
Timer Ak counter + 1
Bit rate generator + 1
= 16 MHz, timer Aj counter = 3, bit rate generator = 0, F = 1860, and D = 1, then the value to be
Timer Aj counterr + 1
= 16 MHz, timer Aj counter = 1, F = 372, and D = 1, then the value to be set in the bit rate
1
for the UART’s source clock signal and set an optional value in the bit rate generator.
page 81 of 354
1
1
1
1
1
x
x
1
2
x
flip-flop
x
flip-flop
x
x
16
0 + 1
1
16
1
1
=16 X
x
x
= f
x
Bit rate generator + 1
F/D
1
1
16
1
1 + 1
1
x
=16 x
Timer Aj counter + 1
x
1
1
2
x
3 + 1
372/1
1
1
1
x
1
2
x
x
16
x flip-flop x
1
1860/1
1
F/D
1
2. SIM interface