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Number
Pin Name
of Pins
PC2
SCLK0
CTS0
PC3
TXD1
PC4
RXD1
PC5
SCLK1
CTS1
XT1
XT2
PD5
SCOUT
PD6
ALARM
MLDALM
PD7
MLDALM
NMI
AM0 to AM1
EMU0
EMU1
RESET
VREFH
VREFL
AVCC
AVSS
X1/X2
DVCC
DVSS
Table 2.3.3 Pin Names and Functions (3/3)
I/O
1
I/O
Port C2: I/O port
I/O
Serial 0 clock
Input
Serial data send enable 0 (Clear to send)
1
I/O
Port C3: I/O port
Output
Serial 1 send data
Open-drain output pin by programmable
1
I/O
Port C4: I/O port
Input
Serial 1 receive data
1
I/O
Port C5: I/O port
I/O
Serial clock I/O 1
Input
Serial 1 data send enable (Clear to send)
1
Input
Low-frequency oscillator connecting pin
1
Output
Low-frequency oscillator connecting pin
1
Output
Port D5: Output port
Output
System clock output: f
1
Output
Port D6: Output port
Output
RTC alarm output pin
Output
1
Output
Port D7: Output port
Output
Melody/alarm output pin
1
Input
Non-maskable interrupt request pin: Interrupt request pin with
programmable falling edge level or with both edge levels programmable
2
Input
Operation mode:
Fixed to AM1 = 0, AM0 = 1 16-bit external bus or 8-/16-bit dynamic sizing.
Fixed to AM1 = 0, AM0 = 0 8-bit external bus fixed.
1
Output
Open pin
1
Output
Open pin
1
Input
Reset: Initializes TMP91C824 (with pull-up resistor).
1
Input
Pin for reference voltage input to AD converter (H)
1
Input
Pin for reference voltage input to AD converter (L)
1
Power supply pin for AD converter
1
GND pin for AD converter (0 V)
2
High-frequency oscillator connection pins
2
Power supply pins (All VCC pins should be connecyed with the power
Supply pin.)
2
GND pins (0 V) (All pins shuold be connected with GND (0 V).)
91C824-8
Functions
or fs output
SYS
TMP91C824
2008-02-20
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