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78
UP3_1
/ UTXD
77
UP3_0
/ URXD
75
UXI/O4
73~ 66
UA[7:0]
/ O[15:8]
57
UP3_7
/ URD_
56
UP3_6
/ UWR_
54
UP3_3
/ UINT1_
53
UP3_2
/ UINT0_
43 ~ 50
UP0_[7:0]
/ UAD[7:0]
38
UALE
37
UPSEN_
36
UP1_0
/ UA16
35, 34, 28, 29
UP2_[7:0]
30, 31, 32, 33
/ UA[15:8]
39
DVDD5
42
DGND
51
DGND
55
DVDD3
74
DVDD5
76
DGND
98
DGND
102
DVDD3
Xtal Interface
40
XTALI
41
XTALO
Varipitch VCO Interface
58
VPVDD
59
VCOCIN
TTL I/O, Slew rate
50K pull_up, 4mA
TTL I/O, Slew rate
50K pull_up, 4mA
TTL otuput, Slew
Microprocessor clock for ICE mode or general output O4 for non-ice
rate, 8mA
TTL I/O, Slew rate
programmable
TTL I/O, Slew rate
SMT, 50K pull_up,
4mA
TTL I/O, Slew rate
SMT, 50K pull_up,
4mA
TTL I/O, Slew rate
50K pull_up, 4mA
TTL I/O, Slew rate
50K pull_up, 4mA
TTL I/O, Slew rate,
programmable
Alternate function : AD[7:0]. Lower address/data bus output for
TTL I/O, 50K
pull_up, 4mA
TTL I/O, 50K
Programmable store enable output, active low. PSEN_ enables the
pull_up, 4mA
TTL I/O, Slew rate
50K pull_up, 4mA
TTL I/O, Slew rate
programmable
Alternate function : A[15:8]. Upper address bus input/output.
Power(5V)
Ground
Ground
Power(3.3V)
Power(5V)
Ground
Ground
Power(3.3V)
Input
Output
Analog power(5V)
Analog Input
Programmable bi-directional I/O.
Alternate function : TXD. Serial transmit data.
Programmable bi-directional I/O.
Alternate function : RXD. Serial receive data.
mode
Lower address bus output for external device.
Alternate function : Programmable output.
Programmable bi-directional I/O.
Alternate function : RD_. Data write signal.
Programmable bi-directional I/O.
Alternate function : WR_. Data write signal.
Programmable bi-directional I/O.
Alternate function : INT1_. External interrupt 0.
Programmable bi-directional I/O.
Alternate function : INT0_. External interrupt 0.
Programmable bi-directional I/O.
external device.
Address latch enable output, active high.
Alternate function : Programmable GPIO.
external ROM output port.
Alternate function : Programmable output.
Programmable bi-directional I/O.
Alternate function : A16. Address bit 16 output.
Programmable bi-directional I/O.
Power pin for output pad circuitry.
Ground pin for output pad circuitry.
Ground pin for internal digital circuitry.
Power pin for internal digital circuitry.
Power pin for output pad circuitry.
Ground pin for output pad circuitry.
Ground pin for internal digital circuitry.
Power pin for internal digital circuitry.
Xtal input. The working frequency is 33.8688 MHz.
Xtal output.
Power pin for varipitch VCO circuitry.
Connect capacitor for compensator loop filter.
47
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