R5F21191SP#U0 Renesas Electronics America, R5F21191SP#U0 Datasheet - Page 116

• Manufacturer Part Number: R5F21191SP#U0
• Description: IC R8C MCU FLASH 8K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/19r

Specifications of R5F21191SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x1b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/18 Group, R8C/19 Group
Rev.1.30
REJ09B0222-0130
Figure 13.3
Watchdog Timer Reset Register
Watchdog Timer Start Register
Count Source Protection Mode Register
b7
NOTES:
b7
b7 b6 b5 b4
NOTES:
1.
2.
1.
2.
0 0 0 0
Do not generate an interrupt betw een w hen 00h and FFh are w ritten.
When the CSPRO bit in the CSPR register is set to 1 (count source protection mode enabled), 0FFFh is set in the
w atchdog timer.
When 0 is w ritten to the CSPROINI bit in the OFS register, the value after reset is 10000000b.
Write 0 before w riting 1 to set the CSPRO bit to 1. 0 cannot be set by a program.
Apr 14, 2006
b3 b2 b1 b0
0
Registers WDTR, WDTS, and CSPR
0
b0
b0
0
When 00h is w ritten before w riting FFh, the w atchdog timer is reset.
The default value of the w atchdog timer is 7FFFh w hen count source protection mode is
disabled and 0FFFh w hen count source protection mode is enabled.
The w atchdog timer starts counting after a w rite instruction to this register.
Bit Symbol
(b6-b0)
CSPRO
Symbol
Symbol
Symbol
WDTR
WDTS
CSPR
Page 99 of 233
—
Reserved bits
Count source protection mode
select bit
Address
Address
(2)
000Dh
000Eh
Address
Bit Name
001Ch
Function
Function
Set to 0.
0 : Count source protection mode disabled
1 : Count source protection mode enabled
After Reset
After Reset
Undefined
Undefined
After Reset
Function
(2)
00h
(1)
(1)
13. Watchdog Timer
WO
WO
RW
RW
RW
RW
RW