M306V2 Mitsubishi, M306V2 Datasheet - Page 176

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

176
2.15 H
Figure 2.15.1 H
Figure 2.15.2 H
The synchronous signal counter counts H
count source.
The count value in a certain time (T time; 1024 µs, 2048 µs, 4096 µs and 8192 µs) divided system clock f
is stored into the 8-bit latch.
Accordingly, the latch value changes in the cycle of T time. When the count value exceeds “FF
is stored into the latch.
The latch value can be obtained by reading out the H
and count update cycle (T time) are selected by bits 0, 3 and 4 of the H
Figure 2.15.1 shows the H
diagram.
Note: When using the H
SYNC
to the main clock frequency.
System clock f
Counter
SYNC
SYNC
H
HC0/P7
HC1/P7
SYNC
b7 b6 b5 b4 b3 b2 b1 b0
32
counter register
counter block diagram
5
7
Selection gate : connected to black
counter register
SYNC
SYNC
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
Freguency divider
counter, set bit 7 of the peripheral mode register (address 027D
HCC0
counter and Figure 2.15.2 shows the synchronous signal counter block
side when reset.
Note: When HC0 and HC1 input are positive polarity (negetive polarity),
Bit symbol
Nothing is assigned. In an attempt to write to this bit, write “0.”
The value, if read, turns out to be “0.”
Nothing is assigned. In an attempt to write to these bits, write “0.”
The value, if read, turns out to be “0.”
HCC0
HCC1
HCC3
HCC4
Symbol
HIGH width (LOW width) needs 3 main clock cycles or more of system clock.
HC
Polarity switch
SYNC
Input polarity
switch bit
Count source switch bit
Count freguency
selection bits
HCC1
Bit name
from H
1024 s
2048 s
4096 s
8192 s
SYNC
SYNC
Address
0267
counter latch (address 027F
b4 b3 <Count freguency>
16
0 : HC0/P7
1 : HC1/P7
0 :
1 :
0 0 : 1024 s
0 1 : 2048 s
1 0 : 4096 s
1 1 : 8192 s
HCC3, HCC4
count input pins (HC0/P7
(Rising edge count)
(Falling edge count)
5
7
pin input
pin input
Function
and ON-SCREEN DISPLAY CONTROLLER
8-bit counter
Latch (8 bits)
XXX00X00
When reset
SYNC
MITSUBISHI MICROCOMPUTERS
Reset
M306V2ME-XXXFP
counter register.
16
R
W
M306V2EEFP
16
5
Counter
H
counter latch
Data bus
). A count source
, HC1/P7
SYNC
16
) according
16
,” “FF
7
) as a
Rev. 1.0
16
32
”