R5F21122FP#U0 Renesas Electronics America, R5F21122FP#U0 Datasheet - Page 26

• Manufacturer Part Number: R5F21122FP#U0
• Description: IC R8C MCU FLASH 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/12r

Specifications of R5F21122FP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/12 Group
Rev.1.20
REJ09B0110-0120
Table 5.1 Pin Status When RESET Pin Level is “L”
P0
P3
P4
5. Reset
P1
0
5 to
5.2 Software Reset
5.3 Watchdog Timer Reset
There are three types of resets: a hardware reset, a software reset, and an watchdog timer reset.
5.1 Hardware Reset
Pin name
to P3
P4
Jan 27, 2006
the reset vector. After reset, the on-chip oscillator clock divided by 8 is automatically selected for the
Where the PM12 bit in the PM1 register is “1” (reset when watchdog timer underflows), the microcom-
puter initializes its pins, CPU and SFR if the watchdog timer underflows. Then the program is ex-
ecuted starting from the address indicated by the reset vector. After reset, the on-chip oscillator clock
divided by 8 is automatically selected for the CPU.
pins, CPU, and SFR initialized. Then the program is executed starting from the address indicated by
When the PM03 bit in the PM0 register is set to “1” (microcomputer reset), the microcomputer has its
CPU.
7
3
A reset is applied using the RESET pin. When an “L” signal is applied to the RESET pin while
the power supply voltage is within the recommended operating condition, the pins are initial-
ized (see Table 5.1 “Pin Status When RESET Pin Level is 'L'”). When the input level at the
____________
RESET pin is released from “L” to “H”, the CPU and SFR are initialized, and the program is
executed starting from the address indicated by the reset vector. Figure 5.1 shows the CPU
register status after reset and figure 5.2 shows the reset sequence. After reset, the on-chip
oscillator clock divided by 8 is automatically selected for the CPU. The internal RAM is not
initialized. If the RESET pin is pulled “L” while writing to the internal RAM, the internal RAM
becomes indeterminate. Figures 5.3 to 5.4 show the reset circuit example. Refer to Chapter 4,
“Special Function Register (SFR)” for the status of SFR after reset.
• When the power supply is stable
(1) Apply an “L” signal to the RESET pin.
(2) Wait for 500 µs (1/f
(3) Apply an “H” signal to the RESET pin.
• Power on
(1) Apply an “L” signal to the RESET pin.
(2) Let the power supply voltage increase until it meets the recommended operating condition.
(3) Wait td(P-R) or more until the internal power supply stabilizes.
(4) Wait for 500 µs (1/f
(5) Apply an “H” signal to the RESET pin.
, P3
7
Input port
Input port
Input port
Input port
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____________
Status
____________
RING
RING
____________
____________
____________
____________
____________
20).
20).
____________
____________
5. Reset