MB90540/540G/545/545G Series
Pin No.
Circuit
Pin name
Function
type
LQFP*2
QFP*1
General I/O port with programmable pullup. This function is
enabled in the single-chip mode, external bus 8-bit mode or
when WRH pin output is disabled.
P33
11
13
I
Write strobe output pin for the 8 higher bits of the data bus.
This function is enabled when the external bus is enabled,
when the external bus 16-bit mode is selected, and when the
WRH output pin is enabled.
WRH
General I/O port with programmable pullup. This function is
enabled in the single-chip mode or when the hold function is
disabled.
P34
HRQ
P35
12
13
14
15
14
15
16
17
I
I
Hold request input pin. This function is enabled when both the
external bus and the hold functions are enabled.
General I/O port with programmable pullup. This function is
enabled in the single-chip mode or when the hold function is
disabled.
Hold acknowledge output pin. This function is enabled when
both the external bus and the hold functions are enabled.
HAK
P36
General I/O port with programmable pullup. This function is
enabled in the single-chip mode or when the external ready
function is disabled.
I
Ready input pin. This function is enabled when both the
external bus and the external ready functions are enabled.
RDY
P37
General I/O port with programmable pullup. This function is
enabled in the single-chip mode or when the CLK output is dis-
abled.
H
CLK output pin. This function is enabled when both the
external bus and CLK outputs are enabled.
CLK
P40
General I/O port. This function is enabled when UART0
disables the serial data output.
16
17
18
19
G
G
Serial data output pin for UART0. This function is enabled
when UART0 enables the serial data output.
SOT0
P41
General I/O port. This function is enabled when UART0
disables serial clock output.
Serial clock I/O pin for UART0. This function is enabled when
UART0 enables the serial clock output.
SCK0
P42
General I/O port. This function is always enabled.
18
19
20
21
G
G
Serial data input pin for UART0. Set the corresponding Port
Direction Register to input if this function is used.
SIN0
P43
General I/O port. This function is always enabled.
Serial data input pin for UART1. Set the corresponding Port
Direction Register to input if this function is used.
SIN1
(Continued)
10
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