r8a66152sp Renesas Electronics Corporation., r8a66152sp Datasheet - Page 3

• Manufacturer Part Number: r8a66152sp
• Description: 12-bit I/o Expander With Led Drive Function
• Manufacturer: Renesas Electronics Corporation.

R8A66152SP
DESCRIPTION OF OPERATION
OPERATION TIMING CHART
REJ03F0259-0100 Rev.1.00 Jan.9.2008
Page 3 of 7
(1) When power ON, the status of DO and D1~D12 terminals are not determined. These terminals are turn
(2) By the negative edge of /CS, the status of D1~D12 terminals is loaded on shift register 1.
(3) Synchronous to the negative edge of CLK, 12-bit loaded data is serial output from the DO terminal.
(4) Synchronous to the positive edge of CLK, 12-bit serial input data from DI is write into the shift register 2.
(5) The 13th and following shift clock pulse are ignored and the serial data input operation is stopped.
(6) By the positive edge of /CS, input data described in (4) is output to D1~D12 terminals.
(7) Shift register 1 loads the AND tie data of external parallel input data and latched data on parallel output
(8) If the /CS is changed from "L" to "H" before reaches the 12th bit of CLK, parallel output latch latches
(9) Input/output mode set to D1~D12 terminals is done by the serial input data to the DI terminal.
CLK
D12
DO
CS
D1
D2
DI
S
And the DO terminal becomes high-impedance ("High-Z").
to high-impedance when "L" is input to the /S terminal.
latch.
data which has been written on shift register 2 and output it to D1~D12 terminals.
Serial data after this since is ignored and the DO terminal becomes high-impedance.
Terminals which "H" is written are set to input, and "L" is written are set to output.
High-Z
High-Z
High-Z
High-Z
(1)
(2)
1
DO1
DI1
(3)
DI1
DI2
DI12
(4)
2
DO2
DI2
3
DO3
DI3
4
DO4
DI4
5
DO5
DI5
6
DO6
DI6
1 Sequence
7
DO7
DI7
8
DO8
DI8
9
DO9 DO10 DO11 DO12
DI9
10
DI10
11
DI11
12
DI12
13
High-Z
(5)
(6)
DO1
DO2
DO12