M37542F8FP Renesas Electronics America, M37542F8FP Datasheet - Page 65

• Manufacturer Part Number: M37542F8FP
• Description: IC 740 MCU FLASH 32K 36SSOP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37542F8FP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 29
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

7542 Group
At on-chip oscillator mode, division ratio of on-chip oscillator for
CPU clock is selected by setting value of on-chip oscillation divi-
sion ratio selection register. The division ratio of on-chip oscillation
for CPU clock is selected from among 1/1, 1/2, 1/8, 1/128. The op-
eration clock for the peripheral function block is not changed by
setting value of this register.
• When system is released from reset, R
• When state transition from the ceramic or RC oscillation to on-
• When the MCU operates by on-chip oscillator for the main clock
Rev.3.03
REJ03B0006-0303
Fig. 81 Structure of on-chip oscillation division ratio selection register
Notes on On-chip Oscillation Division Ratio
middle-speed mode) is selected for CPU clock.
chip oscillator, R
is selected for CPU clock.
without external oscillation circuit, connect X
through a resistor and leave X
Set “10010x00
b7
On-chip oscillation division ratio
Jul 11, 2008
2
” (x = 0 or 1) to CPUM.
OSC
b0
/8 (on-chip oscillator middle-speed mode)
On-chip oscillation division ratio selection register
(RODR: address 0037
On-chip oscillator division ratio
Not used (returns “0” when read)
b1 b0
0 0: On-chip oscillator double-speed mode (R
0 1: On-chip oscillator high-speed mode (R
1 0: On-chip oscillator middle-speed mode (R
1 1: On-chip oscillator low-speed mode (R
Page 63 of 117
OUT
pin open.
16
, initial value: 02
OSC
/8 (on-chip oscillator
16
IN
)
pin to V
OSC
OSC
OSC
OSC
/128)
/2)
/8)
/1)
CC