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| 型號(hào)： | M34507M4-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.4 MHz, MICROCONTROLLER, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 177/217頁(yè) |
| 文件大?。?/td> | 3518K |
| 代理商： | M34507M4-XXXFP |
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4507 Group User’s Manual
HARDWARE
1-49
Note [2] on bit 3 of register I1
When the bit 3 of register I1 is cleared, the RAM back-up mode is
selected and the input of INT pin is disabled, be careful about the
following notes.
When the key-on wakeup function of port P13 is not used (regis-
ter K13 = “0”), clear bits 2 and 3 of register I1 before system
enters to the RAM back-up mode. (refer to Figure 46).
LA
0
; (002)
TI1A
; Input of INT disabled ........................
DI
EPOF
POF2
; RAM back-up
: these bits are not used here.
Fig. 46 External 0 interrupt program example-2
Note [3] on bit 2 of register I1
When the interrupt valid waveform of the P13/INT pin is changed
with the bit 2 of register I1 in software, be careful about the fol-
lowing notes.
Depending on the input state of the P13/INT pin, the external 0 in-
terrupt request flag (EXF0) may be set when the bit 2 of register
I1 is changed. In order to avoid the occurrence of an unexpected
interrupt, clear the bit 0 of register V1 to “0” (refer to Figure 47)
and then, change the bit 2 of register I1.
In addition, execute the SNZ0 instruction to clear the EXF0 flag
after executing at least one instruction (refer to Figure 47).
Also, set the NOP instruction for the case when a skip is per-
formed with the SNZ0 instruction (refer to Figure 47).
LA
4
; (02)
TV1A
; The SNZ0 instruction is valid ...........
LA
12
TI1A
; Interrupt valid waveform is changed
NOP
...........................................................
SNZ0
; The SNZ0 instruction is executed
(EXF0 flag cleared)
NOP
...........................................................
: these bits are not used here.
Fig. 47 A-D conversion interrupt program example
Clock control
Execute the CMCK or the CRCK instruction in the initial setting
routine of program (executing it in address 0 in page 0 is recom-
mended).
The oscillation circuit by the CMCK or CRCK instruction can be
selected only at once. The oscillation circuit corresponding to the
first executed one of these two instruction is valid. Other oscilla-
tion circuits and the ring oscillator stop.
Ring oscillator
The clock frequency of the ring oscillator depends on the supply
voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
Also, the oscillation stabilize wait time after system is released
from reset is generated by the ring oscillator clock. When consid-
ering the oscillation stabilize wait time after system is released
from reset, be careful that the variable frequency of the ring oscil-
lator clock.
External clock
When the external signal clock is used as the source oscillation
(f(XIN)), note that the RAM back-up mode (POF2 instructions)
cannot be used.
Notes for the use of A-D conversion 1
Note the following when using the analog input pins also for ports
P2 and P3 functions:
Selection of analog input pins
Even when P20/AIN0, P21/AIN1, P30/AIN2, P31/AIN3 are set to pins
for analog input, they continue to function as ports P2 and P3 in-
put/output. Accordingly, when any of them are used as I/O port
and others are used as analog input pins, make sure to set the
outputs of pins that are set for analog input to “1.” Also, the port
input function of the pin functions as an analog input is unde-
fined.
TALA instruction
When the TALA instruction is executed, the low-order 2 bits of
register AD is transferred to the high-order 2 bits of register A, si-
multaneously, the low-order 2 bits of register A is “0.”
15
16
17
18
LIST OF PRECAUTIONS
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| M34508G4FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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