Rism Command Descriptions - Intel 8XC196K Series User Manual

8XC196K x , J x , CA USER'S MANUAL
Upon entering serial port programming mode, the device enters a waiting loop, called
Monitor_Pause, in which it waits for RISM commands to arrive across the serial port. The com-
mands are each one byte in length and have values between 00H and 1FH. A value between 00H
and 1FH is considered a command unless it follows a data latch enable (SET_DLE_FLAG) com-
mand. The SET_DLE_FLAG command sets the DLE flag in the MODE register (57H). The DLE
flag alerts the RISM to store the next byte in the DATA register, a 32-bit first-in-last-out (FILO)
register located at 58H.
When a receive interrupt occurs, the RISM checks the data value and the DLE flag. If the data
value is greater than 1FH or if the DLE flag is set, the received byte is considered data and is
stored in the DATA register (58H). Each time new data is received, the DATA register is shifted
left by eight bits. If the value is between 00H and 1FH and the DLE flag is clear, the received byte
is considered a command. Commands are stored in the CHAR register (56H). After it executes
each command, the RISM resumes Monitor_Pause, except where otherwise noted.
To access a particular address, you must first send the address across the serial port as data. Send
it one byte at a time, with the high byte first (the address is always assumed to be 16 bits). The
RISM stores the address data in the DATA register. Now you must transfer the address from the
DATA register to the ADDR register (5CH) by sending the DATA_TO_ADDR command (0AH).

16.10.5 RISM Command Descriptions

Table 16-15 lists and describes the RISM commands. The following sections provide examples.
Value Command
00H SET_DLE_FLAG
02H TRANSMIT
16-36
Table 16-15. RISM Command Descriptions
Sets the DLE flag in bit 0 of the MODE register (57H) to tell the RISM that the next
byte on the serial port is data that should be loaded into the DATA register (58H).
The flag is cleared as soon as the byte is read.
Transmits the low byte of the DATA register to the serial port through the CHAR
register, shifts the DATA register right (long) by eight bits, and increments ADDR
by one.
ADDR
Before command 22
After command 22
Description
DATA
14 7A 2F 80
15 00 7A 2F
SBUF_TX
67
80 67