參數(shù)資料
型號： M37754S4CGP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16BIT CMOS MICROCOMPUTER
中文描述： 單芯片16位微機(jī)的CMOS
文件頁數(shù)： 62/114頁
文件大?。?/td> 1116K
代理商： M37754S4CGP
62
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
RESET CIRCUIT
Reset is released when the RESET pin is returned to “H” level after
holding it at “L” level while the supply voltage is at 5V ±10%. As the
result, program execution starts at the address formed by setting the
address A
23
–A
16
to 00
16
, A
15
–A
8
to the contents of address FFFF
16
,
and A
7
–A
0
to the contents of address FFFE
16
.
Figure 76 shows the status of the internal registers during reset.
Figure 77 shows an example of a reset circuit. When a stabilized
clock is input from the external to the oscillation circuit, the reset in-
put voltage must be held 0.9V or lower when the supply voltage
reaches 4.5V. When connecting a resonator to the oscillation circuit,
return the reset input voltage from “L” to “H” after the main-clock os-
cillation is fully stabilized
RESET
V
CC
V
CC
RESET
Power on
4.5V
0 V
0 V
0.9V
Fig. 77 Reset circuit example (perform careful evaluation at system
design before using)
INPUT/OUTPUT PINS
Ports P0 to P11 all have the direction register and each bit can be
programmed for input or output. A pin becomes an output pin when
the corresponding bit of direction register is “1”, and an input pin
when it is “0”.
When a pin is programmed for output, the data is written to its port
latch and it is output to the output pin. When a pin is programmed for
output, the contents of the port latch is read instead of the value of
the pin. Accordingly, a previously output value can be read correctly
even when the output “H” voltage is lowered or the output “L” voltage
is raised owing to an external load and others.
A pin programmed as an input pin is floating, and the value input to
the pin can be read. When a pin is programmed as an input pin, the
data is written only in the port latch and the pin remains floating.
Additionally, ports P9
5
, P5
4
to P5
7
include pull-up transistors. The
pull-up function of ports is selected with bits 7 and 6 of the particular
function select register 1. Refer to the section on Interrupts for the
pull-up function.
Figures 78 and 79 show block diagrams of ports P0 to P11 in the
single-chip mode and E output.
Ports P0 to P4, P10 and P11 are also used as pins of address, data
and control signals. Refer to the section on Processor mode for more
details.
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