RL78 datasheet(73/100 Pages) RENESAS

73 / 100 page

RL78/G14

2. ELECTRICAL SPECIFICATIONS

R01DS0053EJ0100 Rev. 1.00

Page 73 of 97

Feb 21, 2012

Note 7.

The smaller maximum transfer rate derived by using fMCK/6 or the following expression is the valid maximum transfer

rate.

Expression for calculating the transfer rate when 1.8 V

 EVDD0 < 3.3 V and 1.6 V  Vb  2.0 V

Note 8.

This value as an example is calculated when the conditions described in the “Conditions” column are met.

Refer to Note 7 above to calculate the maximum transfer rate under conditions of the customer.

Caution

Select the TTL input buffer for the RxDq pin and the N-ch open drain output (EVDD0 tolerance) mode for the TxDq

pin by using port input mode register g (PIMg) and port output mode register g (POMg).

Remark 1. Rb[

]: Communication line (TxDq) pull-up resistance,

Cb[F]: Communication line (TxDq) load capacitance, Vb[V]: Communication line voltage

Remark 2.

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

Remark 3.

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))

Remark 4.

VIH and VIL below are observation points for the AC characteristics of the serial array unit when communicating at

different potentials in UART mode.

4.0 V

 EVDD0  5.5 V, 2.7 V  Vb  4.0 V: VIH = 2.2 V, VIL = 0.8 V

2.7 V

 EVDD0 < 4.0 V, 2.3 V  Vb  2.7 V: VIH = 2.0 V, VIL = 0.5 V

1.8 V

 EVDD0 < 3.3 V, 1.6 V  Vb  2.0 V: VIH = 1.50 V, VIL = 0.32 V

Remark 5.

UART2 cannot communicate at different potential when bit 1 (PIOR01) of peripheral I/O redirection register 0 (PIOR0) is

UART mode connection diagram (during communication at different potential)

Maximum transfer rate =

[bps]

Baud rate error (theoretical value) =

Transfer rate

 2

{-Cb

 Rb  In (1 -

)}

 3

1.5

{-Cb

 Rb  In (1 -

)}

1.5

(

)

 Number of transferred bits

Transfer rate

 100 [%]

* This value is the theoretical value of the relative difference between the transmission and reception sides.

TxDq

RxDq

User’s device

RL78/G14

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