M37270MF Datasheet, PDF (74/94 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
16µs
32µs
Control
RE1
circuit
RE0
INT2 (Note)
8-bit binary up counter (8)
8
INT1 (Note)
RE2
Interrupt interval determination register(8)
(Address 021116)
8
Selection gate : Connected to
black colored
side at rest.
Data bus
RE: Input interval determination control register
Note: The pulse width of external interrupt INT1 and INT2 needs 5 or more machine cycles.
Fig. 83. Block diagram of interrupt interval determination circuit
7
0
Interrupt interval determination
control register
(RE : address 021216)
INT1 or INT2 input
Interrupt interval determination
circuit operation control bit
0 : Stopped
1 : Operating
Reference clock control selection
bit
(at f(XIN) = 8MHz)
0 : 32µs
1 : 16µs
External interrupt input pin
selection bit
0 : INT1 input
1 : INT2 input
RE5 _REi
00
01
10
11
Count interval
REi : Bit i (i = 3, 4) of interrupt interval determination
control register (address 021116)
INT1 pin input polarity switch bit
0 : Positive polarity input
1 : Negative polarity input
Fig. 85. Setting value of interrpt interval determination control
INT2 pin input polarity switch bit
0 : Positive polarity input
1 : Negative polarity input
register and measuring interval
Interrupt interval determination mode
switch bit
0 : Interrupt interval determination
mode
1 : Pulse width determination mode
INT3 pin input polarity switch bit
0 : Positive polarity input
1 : Negative polarity input
A-D conversion • INT3 interrupt
source selection bit
0 : INT3 interrupt
1 : A-D conversion interrupt
Fig. 84. Structure of interrupt interval determination control
register
74