Toshiba TMP91C815F Data Book page 69

(5) Port 76(MSK),77(VEECLK)
Port76 and 77 are general-purpose I/O ports. These are also used as clock control function for
voltage booster of external LCD driver.
MSK pin (P76) is a input pin from external LCD driver, clock output from VEECLK pin is
controlled by state of this pin. Logic of this pin is controlled with P7FC<P76F>.
VEECLK pin outputs clock of 32KHz for voltage booster or "0" level according to request from
MSK pin. VEECLK output is controlled with P7FC<P77F>.
Reset
Direction
control
(on bit basis)
P7CR write
S
Output latch
P7 write
P7 read
Function
control
(on bit basis)
P7FC write
fs clock
VEECLK
Reset
Direction
control
(on bit basis)
P7CR write
Function
control
(on bit basis)
P7FC write
S
Output latch
P7 write
P7 read
S
B
Selector
A
S
A
Selector
B
S
B
Selector
A
Figure 3.5.16 Port 76,77
91C815-
66
TMP91C815
P76 (MSK)
P77 (VEECLK)