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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： | 30/41页 |
| 文件大小： | 243K |
| 代理商： | M34238MK-XXXGP |
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MITSUBISHI MICROCOMPUTERS
4238 Group
PROM VERSION OF M34238MK-XXXGP
35
NOTES ON HANDLING
(1) A high-voltage is used for writing. Take care that overvoltage is
not applied. Take care especially at turning on the power.
(2) For the One Time PROM version shipped in blank, Mitsubishi
Electric corp. does not perform PROM writing test and screen-
ing in the assembly process and following processes. In order to
improve reliability after writing, performing writing and test ac-
cording to the flow shown in Figure 5 before using is recom-
mended.
Products shipped in blank: PROM contents is not written in factory
when shipped.
Fig.5 Flow of writing and test of the product shipped in blank
3
Note on external clock
When using an external clock, do not stop the clock except at the
RAM back-up state.
When using an external clock, its duty ratio must be 30 to 70%.
4
Notes on internal state when system is released from reset, and
is returned from the RAM back-up state and standby state
Figure 6 shows the internal state when system is released from
reset, and is returned from the RAM back-up state and standby
state. In the RAM back-up state, data except RAM is not retained
and is initialized as shown in Figure 6.
Program counter (PC) .............
(address 0 in page 0 is set to PC)
Machine cycle count value select register MC.......................
Carrier wave select register C ......................................
Logic operation select register LO ...............................
Port output latch (D, E, CARR) ....................................
Port output latch (G) ................................................
Registers A and B ..................................................
Power down flag (P)
When system is released from reset, and is returned from
standby state ..........................................................................
When system is returned from RAM back-up state ...............
Registers and flags other than above are undefined when system is
released from reset, and is returned from the RAM back-up state and
standby state. Set initial values when system is released from reset,
and is returned from the RAM back-up state and standby state.
0 0 0 0 0 0 0 0 0 0
0
1 1 1
0 0
1
1 1 1 1
0
1
Fig. 6 Internal state when system is released from reset, and
is returned from the RAM back-up state and standby
state.
NOTES ON USE
1
Notes on noise and latch-up
In order to avoid noise and latch-up, connect a bypass capacitor
(approx. 0.1
F) directly between the VDD pin and VSS pin using
the thickest possible wire, and equalize its wiring in width and
length.
2
Notes on instruction clock switch function
Note the following about the instruction clock switch function;
1.The CCK instruction can be used only at address 0 in page 0.
2.Note that the selective range of system clock signal f(XIN) var-
ies depending on whether to use the CCK instruction as
shown in Table 2.
CCK instruction
Used
Not used
Table 2 Selective range of f(XIN) frequency
Instruction clock
f(XIN)/4
f(XIN)/32
f(XIN) frequency
300 kHz to 500 kHz
2.4 MHz to 4.0 MHz
Writing with PROM programmer
Screening (Leave at 150
°C for 40 hours) (Note)
Verify test with PROM programmer
Function test in target device
Since the screening temperature is higher
than storage temperature, never expose the
microcomputer to 150
°C exceeding 100
hours.
Note:
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