HD64570 Datasheet, PDF (194/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Transmit character writing
Idle state
Start bit transmission
Character transmission
Stop bit
Parity bit ^transmission
transmission
Idle state
Transmit
data
Transmit
clock
D₀
D₁
D₆
D₇
P
(a) 1/1 Clock Mode
P: Parity bit
Transmit
data
Transmit
clock
Start bit
D₀
D₇
P
16, 32, or 64 clock cycles
(b) 1/16, 1/32 or 1/64 Clock Mode
Figure 5.14 Transmission Operation
Stop bit(s)
P: Parity bit
Rev. 0, 07/98, page 178 of 453