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參數(shù)資料
| 型號(hào)： | M37540E8SP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 329/366頁(yè) |
| 文件大?。?/td> | 4237K |
| 代理商： | M37540E8SP |
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HARDWARE
1-46
7540 Group User’s Manual
q Oscillation stop detection circuit (Note)
The oscillation stop detection circuit is used for reset occurrence
when a ceramic resonator or an oscillation circuit stops by discon-
nection. When internal reset occurs, reset because of oscillation
stop can be detected by setting “1” to the oscillation stop detection
status bit.
Also, when using the oscillation stop detection circuit, a built-in
ring oscillator is required.
Figure 53 shows the state transition.
Note: The oscillation stop detection circuit is not included in the
emulator MCU “M37540RSS”.
Fig. 50 Structure of MISRG
MISRG(address 003816, initial value: 0016)
b7
b0
Oscillation stabilization time set bit after
release of the STP instruction
0: Set “0116” in timer1, and “FF16”
in prescaler 1 automatically
1: Not set automatically
Ceramic or RC oscillation stop detection
function active bit
0: Detection function inactive
1: Detection function active
Reserved bits (return “0” when read)
(Do not write “1” to these bits)
Not used (return “0” when read)
Oscillation stop detection status bit
0: Oscillation stop not detected
1: Oscillation stop detected
(1) Oscillation control
Stop mode
When the STP instruction is executed, the internal clock
φ stops at
an “H” level and the XIN oscillator stops. At this time, timer 1 is set
to “0116” and prescaler 1 is set to “FF16” when the oscillation sta-
bilization time set bit after release of the STP instruction is “0”. On
the other hand, timer 1 and prescaler 1 are not set when the
above bit is “1”. Accordingly, set the wait time fit for the oscillation
stabilization time of the oscillator to be used. f(XIN)/16 is forcibly
connected to the input of prescaler 1. When an external interrupt
is accepted, oscillation is restarted but the internal clock
φ remains
at “H” until timer 1 underflows. As soon as timer 1 underflows, the
internal clock
φ is supplied. This is because when a ceramic oscil-
lator is used, some time is required until a start of oscillation. In
case oscillation is restarted by reset, no wait time is generated. So
apply an “L” level to the RESET pin while oscillation becomes
stable.
Also, the STP instruction cannot be used while CPU is operating
by a ring oscillator.
Wait mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level, but the oscillator does not stop. The internal clock re-
starts if a reset occurs or when an interrupt is received. Since the
oscillator does not stop, normal operation can be started immedi-
ately after the clock is restarted. To ensure that interrupts will be
received to release the STP or WIT state, interrupt enable bits
must be set to “1” before the STP or WIT instruction is executed.
s Notes on clock generating circuit
For use with the oscillation stabilization set bit after release of the
STP instruction set to “1”, set values in timer 1 and prescaler 1 af-
ter fully appreciating the oscillation stabilization time of the
oscillator to be used.
Switch of ceramic and RC oscillations
After releasing reset the operation starts by starting a built-in ring
oscillator. Then, a ceramic oscillation or an RC oscillation is se-
lected by setting bit 5 of the CPU mode register.
Double-speed mode
When a ceramic oscillation is selected, a double-speed mode can
be used. Do not use it when an RC oscillation is selected.
CPU mode register
Bits 5, 1 and 0 of CPU mode register are used to select oscillation
mode and to control operation modes of the microcomputer. In or-
der to prevent the dead-lock by error-writing (ex. program
run-away), these bits can be rewritten only once after releasing re-
set. After rewriting it is disable to write any data to the bit. (The
emulator MCU “M37540RSS” is excluded.)
Also, when the read-modify-write instructions (SEB, CLB) are ex-
ecuted to bits 2 to 4, 6 and 7, bits 5, 1 and 0 are locked.
Clock division ratio, XIN oscillation control, ring oscillator control
The state transition shown in Fig. 52 can be performed by setting
the clock division ratio selection bits (bits 7 and 6), XIN oscillation
control bit (bit 4), ring oscillator oscillation control bit (bit 3) of CPU
mode register. Be careful of notes on use in Fig. 52.
FUNCTIONAL DESCRIPTION
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相關(guān)代理商/技術(shù)參數(shù) |
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| M37540E8T-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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