TMPM330 - Keil

Under development
1) RAM Transfer Command (See Table 17-6)
TMPM330 (rev 0.4)17-25
TMPM330
1. The 1st byte specifies which one of the two serial operation modes is used. For a
detailed description of how the serial operation mode is determined, see
Determination of a Serial Operation Mode described later. If it is determined as UART
mode, the boot program then checks if the SIO0 is programmable to the baud rate at
which the 1st byte was transferred. During the first-byte interval, the RXE bit in the
HSC0MOD register is cleared.
• To communicate in UART mode
Send, from the controller to the target board, 86H in UART data format at the
desired baud rate. If the serial operation mode is determined as UART, then the
boot program checks if the SIO0 can be programmed to the baud rate at which the
first byte was transferred. If that baud rate is not possible, the boot program aborts,
disabling any subsequent communications.
• To communicate in I/O Interface mode
Send, from the controller to the target board, 30H in I/O Interface data format at
1/16 of the desired baud rate. Also send the 2nd byte at the same baud rate. Then
send all subsequent bytes at a rate equal to the desired baud rate.
In I/O Interface mode, the CPU sees the serial receive pin as if it were a general
input port in monitoring its logic transitions. If the baud rate of the incoming data is
high or the chip’s operating frequency is high, the CPU may not be able to keep up
with the speed of logic transitions. To prevent such situations, the 1st and 2nd
bytes must be transferred at 1/16 of the desired baud rate; then the boot program
calculates 16 times that as the desired baud rate. When the serial operation mode
is determined as I/O Interface mode, the SIO0 is configured for SCLK Input mode.
Beginning with the third byte, the controller must ensure that its AC timing
restrictions are satisfied at the selected baud rate. In the case of I/O Interface
mode, the boot program does not check the receive error flag; thus there is no
such thing as error acknowledge (bit 3, x8H).
2. The 2nd byte, transmitted from the target board to the controller, is an acknowledge
response to the 1st byte. The boot program echoes back the first byte: 86H for UART
mode and 30H for I/O Interface mode.
UART mode
If the SIO0 can be programmed to the baud rate at which the 1st byte was transferred,
the boot program programs the SC0BRCR and sends back 86H to the controller as an
acknowledge. If the SIO0 is not programmable at that baud rate, the boot program
simply aborts with no error indication. Following the 1st byte, the controller should allow
for a time-out period of five seconds. If it does not receive 86H within the allowed
time-out period, the controller should give up the communication. The boot program
sets the RXE bit in the SC0MOD0 register to enable reception (1) before loading the
SIO transmit buffer with 86H.
• I/O Interface mode
The boot program programs the SC0MOD0 and SC0CR registers to configure the
SIO0 in I/O Interface mode (clocked by the rising edge of SCLK0), writes 30H to
Flash Memory Operation