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参数资料
| 型号： | M34238MK-XXXGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | PLASTIC, SOP-20 |
| 文件页数： | 7/41页 |
| 文件大小： | 243K |
| 代理商： | M34238MK-XXXGP |
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MITSUBISHI MICROCOMPUTERS
4238 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
14
RESET FUNCTION
____________
System reset is performed by applying “L” level to the RESET pin for
1 machine cycle or more.
____________
Then when “H” level is applied to the RESET pin, the program execu-
tion starts at address 0 in page 0. The internal state at reset is shown
below (they are the same when system is released from reset).
(1) The contents of program counter is “0”.
(The address 0 in page 0 is set.)
(PC)
← 0
(2) The contents of machine cycle count value select register MC is
“0”.
(MC)
← 0
(3) The contents of carrier wave select register C is “7”.
(C)
← 7
(4) All output latches of ports D, G, E and CARR are “1”.
(D) = (G) = (E) = (CARR)
← 1
CLOCK GENERATING CIRCUIT
System clock (f(XIN)) is obtained by externally connecting a ceramic
resonator. Connect this external circuit to pins XIN and XOUT at the
shortest possible distance. A feedback resistor is built in between
pins XIN and XOUT.
When an external clock signal is input, connect the external oscilla-
tion circuit to XIN and leave XOUT open.
DATA REQUIRED FOR MASK ORDERING
Please submit the following data for mask orders.
(1) M34238MK-XXXGP Mask Confirmation Form
(2) ROM data ............................................................ EPROM 3 sets
(Submit three sets of EPROM’s with the same data)
(3) Mark Specification Form
Fig. 17 Ceramic resonator external circuit
Fig. 18 External clock input circuit
M34238MK-XXXGP
XIN
XOUT
CIN
COUT
45
Note : Use the resonator
manufacturer’s recommended
value because constants such
as capacitance depend on
the resonator
External oscillation circuit
Open
XIN
3V
0V
XOUT
45
M34238MK-XXXGP
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