RL78 datasheet(63/100 Pages) RENESAS

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RL78/G14

2. ELECTRICAL SPECIFICATIONS

R01DS0053EJ0100 Rev. 1.00

Page 63 of 97

Feb 21, 2012

Caution

The pins mounted depend on the product. Refer to 1.3.1 30-pin products to 1.3.10 100-pin products.

2.5

Peripheral Functions Characteristics

2.5.1

Serial array unit

UART mode connection diagram (during communication at same potential)

UART mode bit width (during communication at same potential) (reference)

Note 1.

Transfer rate in the SNOOZE mode is MAX. 9600 bps and MIN. 4800 bps.

Note 2.

The following conditions are required for low voltage interface when EVDD0 < VDD.

2.4 V

 EVDD0 < 2.7 V : MAX. 2.6 Mbps

1.8 V

 EVDD0 < 2.4 V : MAX. 1.3 Mbps

1.6 V

 EVDD0 < 1.8 V : MAX. 0.6 Mbps

Caution

Select the normal input buffer for the RxDq pin and the normal output mode for the TxDq pin by using port input

mode register g (PIMg) and port output mode register g (POMg).

Remark 1. q: UART number (q = 0 to 3), g: PIM and POM number (g = 0, 1, 5, 14)

Remark 2. fMCK: Serial array unit operation clock frequency

(Operation clock to be set by the CKSmn bit of serial mode register mn (SMRmn). m: Unit number,

n: Channel number (mn = 00 to 03, 10 to 13))

(1)

During communication at same potential (UART mode) (dedicated baud rate generator output)

(TA = -40 to +85

C, 1.6 V  EVDD0 = EVDD1  5.5 V, VSS = EVSS0 = EVSS1 = 0 V)

Parameter

Symbol

Conditions

MIN.

TYP.

MAX.

Unit

Transfer rate Note 1

fMCK/6 Note 2

bps

Theoretical value of the maximum transfer

rate fCLK = 32 MHz, fMCK = fCLK

5.3

Mbps

TxDq

RxDq

User’s device

RL78/G14

Baud rate error tolerance

TxDq

RxDq

High-/Low-bit width

1/Transfer rate

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