R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 341

MCU 1KB FLASH 16K ROM 20-LSSOP

R5F21324CNSP#U0

Manufacturer Part Number
R5F21324CNSP#U0
Description
MCU 1KB FLASH 16K ROM 20-LSSOP
Manufacturer
Renesas Electronics America
Series
R8C/3x/32Cr
Datasheet

Specifications of R5F21324CNSP#U0

Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
POR, PWM, Voltage Detect, WDT
Number Of I /o
15
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
20-LSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 312 of 573
Figure 21.8
21.4.1
Table 21.8
Note:
Bit Rate
115200
14400
19200
28800
38400
57600
(bps)
1200
2400
4800
9600
1. For the high-speed on-chip oscillator, the correction value in the FRA4 register should be written into the FRA1
In UART mode, the bit rate is the frequency divided by the U0BRG register and divided by 16.
register and the correction value in the FRA5 register should be written into the FRA3 register.
This applies when the high-speed on-chip oscillator is selected as the system clock and bits FRA22 to FRA20
in the FRA2 register are set to 000b (divide-by-2 mode). For the precision of the high-speed on-chip oscillator,
refer to 31. Electrical Characteristics.
U0BRG
Source
Count
Bit Rate
f8
f8
f8
f1
f1
f1
f1
f1
f1
f1
Setting value in U0BRG register =
Setting value in U0BRG register =
Formula for Calculating Setting Value in U0BRG Register
Bit Rate Setting Example in UART Mode (Internal Clock Selected)
UART mode
129 (81h)
129 (81h)
64 (40h)
32 (20h)
86 (56h)
64 (40h)
42 (2Ah)
32 (20h)
21 (15h)
10 (0Ah)
U0BRG
Setting
Value
• Internal clock selected
• External clock selected
System Clock = 20 MHz
113636.36
14367.82
19230.77
29069.77
37878.79
56818.18
Actual
(bps)
Time
1201.92
2403.85
4734.85
9615.38
fj: Count source frequency of U0BRG register (f1, f8, f32, or fC)
fEXT: Count source frequency of U0BRG register (external clock)
Setting
Error
(%)
-1.36 29 (1Dh)
-0.22 79 (4Fh)
-1.36 29 (1Dh)
-1.36 19 (13h)
-1.36
0.16 119 (77h)
0.16 59 (3Bh)
0.16 119 (77h)
0.16 59 (3Bh)
0.94 39 (27h)
System Clock = 18.432 MHz
U0BRG
9 (09h)
Setting
Value
Bit Rate × 16
Bit Rate × 16
fEXT
115200.00
fj
14400.00
19200.00
28800.00
38400.00
57600.00
Actual
Time
(bps)
1200.00
2400.00
4800.00
9600.00
Setting
Error
− 1
− 1
(%)
0.00 51 (33h)
0.00 25 (19h)
0.00 12 (0Ch)
0.00 51 (33h)
0.00 34 (22h)
0.00 25 (19h)
0.00 16 (10h)
0.00 12 (0Ch)
0.00
0.00
(1)
U0BRG
8 (08h)
Setting
Value
21. Serial Interface (UART0)
System Clock = 8 MHz
14285.71
19230.77
29411.76
38461.54
55555.56
Actual
Time
(bps)
1201.92
2403.85
4807.69
9615.38
Setting
Error
(%)
-0.79
-3.55
0.16
0.16
0.16
0.16
0.16
2.12
0.16

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