M37544G2AGP#U0 Renesas Electronics America, M37544G2AGP#U0 Datasheet - Page 38

• Manufacturer Part Number: M37544G2AGP#U0
• Description: IC 740 MCU OTP 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37544G2AGP#U0

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: WDT
• Number Of I /o: 25
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: QzROM
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Rev.1.04
REJ03B0012-0104Z
7544 Group
(1) Oscillation control
• Stop mode
When the STP instruction is executed, the internal clock
an “H” level and the X
to “01
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. Single selected by
the timer 1 count source selection bit is connected to the input of
prescaler 1. When an external interrupt is accepted, oscillation is
restarted but the internal clock
underflows. As soon as timer 1 underflows, the internal clock
supplied. This is because when a ceramic/quartz-crystal oscillator
is used, some time is required until a start of oscillation. In case
oscillation is restarted by reset, no wait time is generated. So ap-
ply an “L” level to the RESET pin while oscillation becomes stable.
Also, the STP instruction cannot be used while CPU is operating
by an on-chip oscillator.
• Wait mode
If the WIT instruction is executed, the internal clock
“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.
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/quartz-crystal and RC oscillations
After releasing reset the operation starts by starting an on-chip os-
cillator. Then, a ceramic/quartz-crystal oscillation or an RC
oscillation is selected by setting bit 5 of the CPU mode register.
• Double-speed mode
When a ceramic/quartz-crystal 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 “M37544RSS” 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.
Notes on clock generating circuit
16
” and prescaler 1 is set to “FF
2004.06.08
______
IN
oscillator stops. At this time, timer 1 is set
page 36 of 66
remains at “H” until timer 1
16
” when the oscillation sta-
stops at an
stops at
is
• Clock division ratio, X
trol
The state transition shown in Fig. 48 can be performed by setting
the clock division ratio selection bits (bits 7 and 6), X
control bit (bit 4), on-chip oscillator oscillation control bit (bit 3) of
CPU mode register. Be careful of notes on use in Fig. 48.
Fig. 44 Structure of CPU mode register
b7
Note 1: The bit can be rewritten only once after releasing reset. After rewriting
2: These bits are used only when a ceramic
Do not use these when an RC oscillation is selected.
it is disable to write any data to the bit. However, by reset the bit is
initialized and can be rewritten, again.
(It is not disable to write any data to the bit for emulator MCU
“M37544RSS”.)
IN
b0
oscillation control, on-chip oscillator con-
CPU mode register
(CPUM: address 003B
Processor mode bits (Note 1)
Stack page selection bit
On-chip oscillator oscillation control bit
X
Oscillation mode selection bit (Note 1)
Clock division ratio selection bits
IN
b1 b0
b7 b6
0
0
1
1
0 : On-chip oscillator oscillation enabled
1 : On-chip oscillator oscillation stop
0 : Ceramic/quartz-crystal or RC oscillation enabled
1 : Ceramic/quartz-crystal or RC oscillation stop
0
0
1
1
0 : 0 page
1 : 1 page
0 : Ceramic/quartz-crystal oscillation
1 : RC oscillation
oscillation control bit
0 Single-chip mode
1
0
1
0 : f(
1 : f(
0 : applied from on-chip oscillator
1 : f(
Not available
) = f(X
) = f(X
) = f(X
/quartz-crystal
16
I N
I N
I N
, initial value: 80
)/2 (High-speed mode)
)/8 (Middle-speed mode)
) (Double-speed mode)(Note 2)
oscillation is selected.
16
)
IN
oscillation