Atr0621 [preliminary, 2 signal description – Rainbow Electronics ATR0621 User Manual
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4890AS–GPS–09/05
ATR0621 [Preliminary]
3.2
Signal Description
VBAT18
G6
OUT
VDD18
E6
IN
VDD18
F7
IN
VDD18
F6
IN
VDDIO
(2)
E5
IN
VDD_USB
(3)
F5
IN
XT_IN
J9
IN
XT_OUT
J10
OUT
Table 3-1.
ATR0621 Pinout (Continued)
Pin Name
LFBGA100
Pin Type
Pull Resistor
(Reset Value)
(1)
Firmware Label
PIO Bank A
PIO Bank B
Notes:
1. PD = internal pull-down resistor, PU = internal pull-up resistor, OH = switched to Output High at reset
2. VDDIO is the supply voltage for the following GPIO pins: P1, P2, P8, P12, P14, P16, P17, P18, P19, P20, P21, P23, P24,
P25, P26, P27 and P29
3. VDD_USB is the supply voltage for the following USB pins: USB_DM and USB_DP. For operation of the USB interface, sup-
ply of 3.0V to 3.6V is required.
Table 3-2.
ATR0621 Signal Description
Module
Name
Function
Type
Active Level Comment
EBI
EM_A0 to EM_A21
External Memory Address Bus
Output
–
All valid after reset
EM_DA0 to EM_DA15 External Memory Data Bus
I/O
–
Internal pull-down resistor
NCS0 to NCS1
Chip Select
Output
Low
Output High in RESET state
NCS2 to NCS3
Chip Select
Output
Low
Output High in RESET state
NWR0
Lower Byte Write Signal
Output
Low
Output High in RESET state
NWR1
Upper Byte Write Signal
Output
Low
Output High in RESET state
NRD
Read Signal
Output
Low
Output High in RESET state
NWE
Write Enable
Output
Low
Output High in RESET state
NOE
Output Enable
Output
Low
Output High in RESET state
NUB
Upper Byte Select (16-bit SRAM)
Output
Low
Output High in RESET state
NLB
Lower Byte Select (16-bit SRAM)
Output
Low
Output High in RESET state
BOOT_MODE
Boot Mode Input
Input
–
PIO-controlled after reset,
internal pull-down resistor
USART
TXD1-2
Transmit Data Output
Output
–
PIO-controlled after reset
RXD1-2
Receive Data Input
Input
–
PIO-controlled after reset
SCK1-2
External Synchronous Serial
Clock
I/O
–
PIO-controlled after reset
USB
USB_DP
USB Data (D+)
I/O
–
USB_DM
USB Data (D-)
I/O
–
APMC
RF_ON
Output
–
Interface to ATR0600
RTC
NSLEEP
Sleep Output
Output
Low
Interface to ATR0600
NSHDN
Shutdown Output
Output
Low
Connect to pin LDO_EN
XT_IN
Oscillator Input
Input
–
RTC oscillator
XT_OUT
Oscillator Output
Output
–
RTC oscillator