R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 65

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K 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
7.
There are 41 programmable Input/Output ports (I/O ports) P0 to P2, P3_0, P3_1, P3_3 to P3_5, P3_7, P4_3 to P4_5,
and P6. Also, P4_6 and P4_7 can be used as input-only ports if the XIN clock oscillation circuit is not used, and the
P4_2 can be used as an input-only port if the A/D converter is not used.
Table 7.1 lists an Overview of Programmable I/O Ports.
7.1
Table 7.1
NOTES:
Table 7.2
i = 0 to 4, 6 j = 0 to 7
NOTE:
P0 to P2, P6
P3_0, P3_1, P3_3 to
P3_4, P3_5, P3_7
P4_3
P4_4, P4_5
P4_2
P4_6, P4_7
Reading
Writing
Operation When
The PDi_j (j = 0 to 7) bit in the PDi (i = 0 to 4, 6) register controls I/O of the ports P0 to P2, P3_0, P3_1, P3_3 to
P3_5, P3_7, P4_3 to P4_5, and P6. The Pi register consists of a port latch to hold output data and a circuit to read
pin states.
Figures 7.1 to 7.7 show the Configurations of Programmable I/O Ports. Table 7.2 lists the Functions of
Programmable I/O Ports. Also, Figure 7.9 shows the PDi (i = 0 to 4 and 6) Registers. Figure 7.10 shows the Pi (i =
0 to 4 and 6) Registers, Figure 7.11 shows Registers PUR0 and PUR1, Figure 7.12 shows the PMR Register, Figure
7.13 shows the P2DRR Register.
Programmable I/O Ports
1. In input mode, whether an internal pull-up resistor is connected or not can be selected by registers
2. When the A/D converter is not used, this port can be used as the input-only port.
3. When the XIN clock oscillation circuit is not used, these ports can be used as the input-only ports.
1. Nothing is assigned to bits PD3_2, PD3_6, PD4_0 to PD4_2, PD4_6, and PD4_7.
Pi Register
Accessing
(2)
PUR0 and PUR1.
Functions of Programmable I/O Ports
Feb 29, 2008
Ports
(3)
Overview of Programmable I/O Ports
Functions of Programmable I/O Ports
Read pin input level
Write to the port latch
When PDi_j Bit is Set to 0 (Input Mode)
I/O
I/O CMOS3 State
I/O CMOS3 State
I/O CMOS3 State
I/O CMOS3 State
Page 46 of 485
I
(No output function)
Type of Output
Value of PDi_j Bit in PDi Register
Set per bit
Set per bit
Set per bit
Set per bit
None
Read the port latch
Write to the port latch. The value written to
the port latch is output from the pin.
I/O Setting
When PDi_j Bit is Set to 1 (Output Mode)
(1)
Internal Pull-Up Resister
Set every 4 bits
Set every 3 bits
Set every bit
Set every 2 bits
None
7. Programmable I/O Ports
(1)
(1)
(1)
(1)