R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 61
![IC R8C MCU FLASH 4K 20SSOP](/photos/12/35/123585/r5f211b1sp_u0_sml.jpg)
R5F211B1SP#U0
Manufacturer Part Number
R5F211B1SP#U0
Description
IC R8C MCU FLASH 4K 20SSOP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/R8C/Tiny/1Br
Datasheets
1.R5F211A2SPU0.pdf
(51 pages)
2.R5F211A2SPU0.pdf
(300 pages)
3.R5F211A2SPU0.pdf
(341 pages)
Specifications of R5F211B1SP#U0
Core Processor
R8C
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SIO, SSU, 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 4x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
20-SSOP
For Use With
R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
6.3
6.4
6.5
6.6
A reset is applied using the on-chip voltage detection 1 circuit. The voltage detection 1 circuit monitors the input
voltage to the VCC pin. The voltage to monitor is Vdet1.
When the input voltage to the VCC pin reaches the Vdet1 level or below, the pins, CPU, and SFR are reset.
When the input voltage to the VCC pin reaches the Vdet1 level or above, the low-speed on-chip oscillator clock
starts counting. When the low-speed on-chip oscillator clock count reaches 32, the internal reset signal is held “H”
and the MCU enters the reset sequence (refer to Figure 6.3). The low-speed on-chip oscillator clock divided by 8 is
automatically selected as the CPU after reset.
Refer to 4. Special Function Registers (SFRs) for the status of the SFR after voltage monitor 1 reset.
The internal RAM is not reset. When the input voltage to the VCC pin reaches the Vdet1 level or below while
writing to the internal RAM is in progress, the contents of internal RAM are undefined.
Refer to 7. Voltage Detection Circuit for details of voltage monitor 1 reset.
A reset is applied using the on-chip voltage detection 2 circuit. The voltage detection 2 circuit monitors the input
voltage to the VCC pin. The voltage to monitor is Vdet2.
When the input voltage to the VCC pin reaches the Vdet2 level or below, pins, CPU, and SFR are reset and the
program beginning with the address indicated by the reset vector is executed. After reset, the low-speed on-chip
oscillator clock divided by 8 is automatically selected as the CPU clock.
The voltage monitor 2 does not reset some SFRs. Refer to 4. Special Function Registers (SFRs) for details.
The internal RAM is not reset. When the input voltage to the VCC pin reaches the Vdet2 level or below while
writing to the internal RAM is in progress, the contents of internal RAM are undefined.
Refer to 7. Voltage Detection Circuit for details of voltage monitor 2 reset.
When the PM12 bit in the PM1 register is set to 1 (reset when watchdog timer underflows), the MCU resets its pins,
CPU, and SFR if the watchdog timer underflows. Then the program beginning with the address indicated by the
reset vector is executed. After reset, the low-speed on-chip oscillator clock divided by 8 is automatically selected as
the CPU clock.
The watchdog timer reset does not reset some SFRs. Refer to 4. Special Function Registers (SFRs) for details.
The internal RAM is not reset. When the watchdog timer underflows, the contents of internal RAM are undefined.
Refer to 13. Watchdog Timer for details of the watchdog timer.
When the PM03 bit in the PM0 register is set to 1 (MCU reset), the MCU resets its pins, CPU, and SFR. The
program beginning with the address indicated by the reset vector is executed. After reset, the low-speed on-chip
oscillator clock divided by 8 is automatically selected for the CPU clock.
The software reset does not reset some SFRs. Refer to 4. Special Function Registers (SFRs) for details.
The internal RAM is not reset.
Voltage Monitor 1 Reset
Voltage Monitor 2 Reset
Watchdog Timer Reset
Software Reset
Dec 08, 2006
Page 43 of 315
6. Resets
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