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Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 467 of 909 2019 Ambiq Micro, Inc.

Table 660: CFGE Register Bits

Bit Name Reset RW Description

31 GPIO39INTD 0x0 RW

GPIO39 interrupt direction.

INTDIS = 0x0 - INCFG = 1 - No interrupt on GPIO transition

INTBOTH = 0x1 - INCFG = 1 - Interrupt on either low to high or high to low

GPIO transition

INTLH = 0x0 - INCFG = 0 - Interrupt on low to high GPIO transition

INTHL = 0x1 - INCFG = 0 - Interrupt on high to low GPIO transition

30:29

GPIO39OUT-

CFG

0x0 RW

GPIO39 output configuration.

DIS = 0x0 - FNCSEL = 0x3 - Output disabled

PUSHPULL = 0x1 - FNCSEL = 0x3 - Output is push-pull

OD = 0x2 - FNCSEL = 0x3 - Output is open drain

TS = 0x3 - FNCSEL = 0x3 - Output is tri-state

28 GPIO39INCFG 0x0 RW

GPIO39 input enable.

READ = 0x0 - Read the GPIO pin data

RDZERO = 0x1 - INTD = 0 - Readback will always be zero

READEN = 0x1 - INTD = 1 - Read the GPIO pin data

27 GPIO38INTD 0x0 RW

GPIO38 interrupt direction.

nCELOW = 0x0 - FNCSEL = 0x1 - nCE polarity active low

nCEHIGH = 0x1 - FNCSEL = 0x1 - nCE polarity active high

INTDIS = 0x0 - FNCSEL != 0x1, INCFG = 1 - No interrupt on GPIO transi-

tion

INTBOTH = 0x1 - FNCSEL != 0x1, INCFG = 1 - Interrupt on either low to

high or high to low GPIO transition

INTLH = 0x0 - FNCSEL != 0x1, INCFG = 0 - Interrupt on low to high GPIO

transition

INTHL = 0x1 - FNCSEL != 0x1, INCFG = 0 - Interrupt on high to low GPIO

transition

26:25

GPIO38OUT-

CFG

0x0 RW

GPIO38 output configuration.

DIS = 0x0 - FNCSEL = 0x3 - Output disabled

PUSHPULL = 0x1 - FNCSEL = 0x3 - Output is push-pull

OD = 0x2 - FNCSEL = 0x3 - Output is open drain

TS = 0x3 - FNCSEL = 0x3 - Output is tri-state

M0nCE3 = 0x0 - FNCSEL = 0x1 - IOM0 nCE, Channel 3

M1nCE3 = 0x1 - FNCSEL = 0x1 - IOM1 nCE, Channel 3

M2nCE3 = 0x2 - FNCSEL = 0x1 - IOM2 nCE, Channel 3

M5nCE3 = 0x3 - FNCSEL = 0x1 - IOM5 nCE, Channel 3

24 GPIO38INCFG 0x0 RW

GPIO38 input enable.

READ = 0x0 - Read the GPIO pin data

RDZERO = 0x1 - INTD = 0 - Readback will always be zero

READEN = 0x1 - INTD = 1 - Read the GPIO pin data