Operation Panel - Oki Pacemark 4410 Service Handbook

2.1.13 Operation Panel

The clock synchronization OPCLK of NHDC LSI is used to input the switch data and output the LED
data and LCD data through the operation panel control LSI (IC1: BU6152S).
NHDC LSI
SDO
SCKN
SCSN
SDI
A 2-byte (15 bits + 1 even parity bit) command (OPDATAOUT-P) is transmitted to the LSI
(BU6152S) in synchronization with the OPSCLK-N signal. The LSI decodes this command and
when it is found to be legal, returns a 2-byte command response back to the NHDC LSI which
includes data on Switch information, LED status, LCD status receive command ACK/NAK and 1
odd parity bit.
Any transmission errors found cause the command to be reissued after the transmission of the
OPSQCR-N signal.
40496501TH Draft Version
BU6152S
OPDATAOUT-P
56
OPSCLK-N
Command
59
and Data
OPSQCR-N
latch
58
OPDATAIN-P
57
Figure 2.17
LED driver
+5V
Switch
controller
29