R5F21272SNFP#U0 Renesas Electronics America, R5F21272SNFP#U0 Datasheet - Page 108

IC R8C/27 MCU FLASH 32LQFP

R5F21272SNFP#U0

Manufacturer Part Number
R5F21272SNFP#U0
Description
IC R8C/27 MCU FLASH 32LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/27r
Datasheet

Specifications of R5F21272SNFP#U0

Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
LED, POR, Voltage Detect, WDT
Number Of I /o
25
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
32-LQFP
For Use With
R0K521276S000BE - KIT DEV RSK-R8C/26-29R0E521000EPB00 - PROBE EMULATOR FOR PC7501
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-

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R8C/26 Group, R8C/27 Group
Rev.2.10
REJ09B0278-0210
The clocks generated by the clock generation circuits are described below.
10.1
Figure 10.11
This clock is supplied by the XIN clock oscillation circuit. This clock is used as the clock source for the CPU and
peripheral function clocks. The XIN clock oscillation circuit is configured by connecting a resonator between the
XIN and XOUT pins. The XIN clock oscillation circuit includes an on-chip feedback resistor, which is
disconnected from the oscillation circuit in stop mode in order to reduce the amount of power consumed by the
chip. The XIN clock oscillation circuit may also be configured by feeding an externally generated clock to the XIN
pin.
Figure 10.11 shows Examples of XIN Clock Connection Circuit.
In reset and after reset, the XIN clock stops.
The XIN clock starts oscillating when the CM05 bit in the CM0 register is set to 0 (XIN clock oscillates) after
setting the CM01 bit in the CM0 register to 1 (XIN clock) and the CM13 bit in the CM1 register to 1 (XIN- XOUT
pin).
To use the XIN clock for the CPU clock source, set the OCD2 bit in the OCD register to 0 (select XIN clock) after
the XIN clock is oscillating stably.
The power consumption can be reduced by setting the CM05 bit in the CM0 register to 1 (XIN clock stops) if the
OCD2 bit is set to 1 (select on-chip oscillator clock).
When an external clock is input to the XIN pin are input, the XIN clock does not stop if the CM05 bit is set to 1. If
necessary, use an external circuit to stop the clock.
This MCU has an on-chip feedback resistor and on-chip resistor disable/enable switching is possible by the CM11
bit in the CM1 register.
In stop mode, all clocks including the XIN clock stop. Refer to 10.5 Power Control for details.
XIN Clock
Sep 26, 2008
Ceramic resonator external circuit
NOTE:
1. Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
(on-chip feedback resistor)
XIN
capacity setting. Use the value recommended by the manufacturer of the oscillator.
Use high drive when oscillation starts and, if it is necessary to switch the oscillation drive capacity, do so after
oscillation stabilizes.
When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's
data sheet specifies that a feedback resistor be added to the chip externally, insert a feedback resistor between XIN
and XOUT following the instructions.
To use this MCU of N, D version with supply voltage below VCC = 2.7 V, it is recommended to set the CM11 bit in
the CM1 register to 1 (on-chip feedback resistor disabled), the CM15 bit to 1 (high drive capacity), and connect the
feedback resistor to the chip externally.
Examples of XIN Clock Connection Circuit
CIN
MCU
Rf
Page 89 of 453
(1)
XOUT
Rd
COUT
(1)
VCC
VSS
Externally derived clock
External clock input circuit
(on-chip feedback resistor)
XIN
MCU
10. Clock Generation Circuit
XOUT
Open

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