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| 型號(hào)： | M34519M8-XXXFP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁(yè)數(shù)： | 116/138頁(yè) |
| 文件大?。?/td> | 1146K |
| 代理商： | M34519M8-XXXFP |
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4519 Group
Rev.3.01
2005.06.15
page 77 of 160
REJ03B0007-0301
POF instruction
When the POF instruction is executed continuously after the
EPOF instruction, system enters the RAM back-up state.
Note that system cannot enter the RAM back-up state when ex-
ecuting only the POF instruction.
Be sure to disable interrupts by executing the DI instruction be-
fore executing the EPOF instruction and the POF instruction
continuously.
Program counter
Make sure that the PC does not specify after the last page of the
built-in ROM.
Power-on reset
When the built-in power-on reset circuit is used, the time for the
supply voltage to rise from 0 V to the value of supply voltage or
more must be set to 100
s or less. If the rising time exceeds 100
s, connect a capacitor between the RESET pin and VSS at the
shortest distance, and input “L” level to RESET pin until the value
of supply voltage reaches the minimum operating voltage.
Clock control
Execute the main clock (f(XIN)) selection instruction (CMCK,
CRCK or CYCK instruction) in the initial setting routine of pro-
gram (executing it in address 0 in page 0 is recommended).
The oscillation circuit by the CMCK, CRCK or CYCK instruction
can be selected only at once. The oscillation circuit correspond-
ing to the first executed one of these instructions is valid.
The CMCK, CRCK, and CYCK instructions can be used only to
select main clock (f(XIN)). In this time, the start of oscillation and
the switch of system clock are not performed.
When the CMCK, CRCK, and CYCK instructions are never ex-
ecuted, main clock (f(XIN)) cannot be used and system can be
operated only by on-chip oscillator.
The no operated clock source (f(RING)) or (f(XIN)) cannot be
used for the system clock. Also, the clock source (f(RING) or
f(XIN)) selected for the system clock cannot be stopped.
On-chip oscillator
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
When considering the oscillation stabilize wait time at the switch
of clock, be careful that the margin of frequencies of the on-chip
oscillator clock.
20
22
23
24
A/D converter-1
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.”
Do not change the operating mode (both A/D conversion mode
and comparator mode) of A/D converter with the bit 3 of register
Q1 while the A/D converter is operating.
Clear the bit 2 of register V2 to “0” to change the operating mode of
the A/D converter from the comparator mode to A/D conversion mode.
The A/D conversion completion flag (ADF) may be set when the
operating mode of the A/D converter is changed from the com-
parator mode to the A/D conversion mode. Accordingly, set a
value to the register Q1, and execute the SNZAD instruction to
clear the ADF flag.
LA
8
; (02)
TV2A
; The SNZAD instruction is valid ........
LA
0
; (02)
TQ1A
; Operation mode of A/D converter is
changed from comparator mode to A/D
conversion mode.
SNZAD
NOP
: these bits are not used here.
Fig. 72 A/D converter program example-3
Fig. 73 Analog input external circuit example-1
A/D converter-2
Each analog input pin is equipped with a capacitor which is used
to compare the analog voltage. Accordingly, when the analog volt-
age is input from the circuit with high-impedance and, charge/
discharge noise is generated and the sufficient A/D accuracy may
not be obtained. Therefore, reduce the impedance or, connect a
capacitor (0.01
F to 1 F) to analog input pins (Figure 73).
When the overvoltage applied to the A/D conversion circuit may
occur, connect an external circuit in order to keep the voltage
within the rated range as shown the Figure 74. In addition, test
the application products sufficiently.
Sensor
AIN
Apply the voltage withiin the specifications
to an analog input pin.
Sensor
AIN
About 1k
18
19
Fig. 74 Analog input external circuit example-2
21
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