R5F21244SNFP#U0 Renesas Electronics America, R5F21244SNFP#U0 Datasheet - Page 96

• Manufacturer Part Number: R5F21244SNFP#U0
• Description: IC R8C MCU FLASH 16K 52LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/24r

Specifications of R5F21244SNFP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 16KB (16K 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 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 10.4
Oscillation Stop Detection Register
b7 b6 b5 b4
NOTES:
0 0 0 0
1.
2.
3.
4.
5.
6.
7.
Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting to the OCD register.
Set bits OCD1 to OCD0 to 00b before entering stop mode, high-speed on-chip oscillator mode, or low -speed on-chip
oscillator mode (XIN clock stops).
The CM14 bit is set to 0 (low -speed on-chip oscillator on) if the OCD2 bit is set to 1 (on-chip oscillator clock
selected).
The OCD2 bit is automatically set to 1 (on-chip oscillator clock selected) if a XIN clock oscillation stop is detected
w hile bits OCD1 to OCD0 are set to 11b. If the OCD3 bit is set to 1 (XIN clock stopped), the OCD2 bit remains
unchanged even w hen set to 0 (XIN clock selected).
The OCD3 bit is enabled w hen the OCD0 bit is set to 1 (oscillation stop detection function enabled).
The OCD3 bit remains 0 (XIN clock oscillates) if bits OCD1 to OCD0 are set to 00b.
Refer to Figure 10.16 Procedure for Sw itching Clock Source from Low -Speed On-Chip Oscillator to XIN
Clock for the sw itching procedure w hen the XIN clock re-oscillates after detecting an oscillation stop.
Feb 29, 2008
b3 b2 b1 b0
OCD Register
Bit Symbol
(b7-b4)
Symbol
OCD0
OCD1
OCD2
OCD3
OCD
Page 77 of 485
—
Oscillation stop detection enable
bit
Oscillation stop detection
interrupt enable bit
System clock select bit
Clock monitor bit
Reserved bits
(7)
(1)
Address
Bit Name
000Ch
(5, 6)
(4)
0 : Oscillation stop detection function
1 : Oscillation stop detection function
0 : Disabled
1 : Enabled
0 : Selects XIN clock
1 : Selects on-chip oscillator clock
0 : XIN clock oscillates
1 : XIN clock stops
Set to 0.
disabled
enabled
(2)
(2)
After Reset
00000100b
Function
(7)
10. Clock Generation Circuit
(3)
RW
RW
RW
RW
RW
RO