M30222 Datasheet, PDF (226/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
Serial I/O Mode 2 (Flash Memory Version)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Peripheral
Unit
(1) Transfer "B016"
(2) Transfer "0016" 16 times
1st
At least 15ms
transfer interval 2nd
"B016"
"B016"
"0016"
"0016"
MCU with internal
flash memory
Reset
If the oscillation frequency input
by the main clock is 10 or 16 MHz,
the MCU outputs "B016". If other
than 10 or 16 MHz, the MCU
does not output anything.
15th
"0016"
16th
"0016"
"B016"
(3) Transfer check code "B016"
The bit rate generator setting completes (9600 bps)
Figure 1.83. Peripheral unit and initial communication
Identifying frequency
When "0016" data is received 16 times from a peripheral unit at a baud rate of 9,600 bps, the value of the bit rate
generator is set to match the operating frequency (2 - 10 MHz). The highest speed is taken from the first 8 transmis-
sions and the lowest from the last 8. These values are then used to calculate the bit rate generator value for a baud
rate of 9,600 bps.
Baud rate cannot be attained with some operating frequencies. Table 1.182 gives the operation frequency and the
baud rate that can be attained for.
Table 1.82. Operation frequency and baud rate
Operation frequency
(MHz)
16
12
11
10
8
7.3728
6
5
4.5
4.194304
4
3.58
3
2
Baud rate
9600 bps
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ : Communications possible
- : Communications not possible
Baud rate
19200 bps
+
+
+
+
+
+
+
+
+
+
+
+
+
-
Baud rate
38400 bps
+
+
+
-
-
+
+
-
-
+
-
+
+
-
Baud rate
57600 bps
+
-
-
-
+
+
-
-
+
-
-
-
-
-
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