Rabbit 2000 - Description of Pins with Alternate Functions

User’s Manual 59
5.5 Description of Pins with Alternate Functions
Table 5-2. Pins With Alternate Functions
Pin Name Output Function Input Function Other Function
STATUS (38)
1. Low on first op code
fetch.
2. Low on interrupt
acknowledge
Programmable output
port high/low
SMODE1 (35)
(SMODE0, SMODE1)
Startup boot mode
control.
1-bit input after boot
complete.
SMODE0 (36)
(SMODE0, SMODE1)
Startup boot mode
control.
1-bit input after boot
complete.
CLK (1)
1. Peripheral clock.
2. Peripheral clock/2.
Programmable output
port high/low
/WDTOUT (34)
Outputs 30.5 µs pulse on
watchdog timeout
(processor is also reset).
Outputs a pulse between
30.5 and 61 µs under
program control.
PA7 (88) SD7 SD7
PA6 (87) SD6 SD6
PA5 (86) SD5 SD5
PA4 (85) SD4 SD4
PA3 (84) SD3 SD3
PA2 (83) SD2 SD2
PA1 (82) SD1 SD1
PA0 (81) SD0 SD0
PB7 (100)
/SLAVEATTN (master
needs attention from
slave).
PB5 (98) SA1 (slave address).
PB4 (97) SA0
PB3 (96)
/SRD (strobe for master
to read a slave register).
PB2 (95)
/SWR (strobe for master
to write slave register).