CHAPTER 31 ELECTRICAL SPECIFICATIONS
Page 882 of 920
Caution
Select the TTL input buffer for the RxDq pin and the N-ch open drain output (V
DD
tolerance) mode for the TxDq
pin by using port input mode register g (PIMg) and port output mode register g (POMg). For V
IH
and V
IL
, see the
DC characteristics with TTL input buffer selected.
UART mode connection diagram (during communication at different potential)
UART mode bit width (during communication at different potential) (reference)
Remark 1.
R
b
[
Ω
]: Communication line (TxDq) pull-up resistance, C
b
[F]: Communication line (TxDq) load capacitance,
V
b
[V]: Communication line voltage
Remark 2.
q: UART number (q = 1, 3), g: PIM and POM number (g = 0, 14)
Remark 3.
f
MCK
: 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 = 02, 03, 12, 13))
RL78 microcontroller
TxDq
RxDq
User’s device
Rx
Tx
V
b
R
b
Baud rate error tolerance
High-/Low-bit width
1/Transfer rate
Baud rate error tolerance
High-bit width
Low-bit width
1/Transfer rate
TxDq
RxDq
Содержание RL78/G1H
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