Manual

8
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